improve diff files

We now have 6 diff rules:

    diff_orig_prog
    diff_prog_orig
    diff_alt_prog
    diff_prog_alt
    diff_orig_alt
    diff_alt_orig

The FAQ for these diffs needs to be updated
as we have 6 types of diffs now.

1984/Makefile

@@ -61,7 +61,8 @@ all:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -107,6 +108,11 @@ everything:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog:
@@ -121,6 +127,20 @@ diff_orig_prog:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff source and orig source
+#
+diff_prog_orig:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
 # diff alt source and source
 #
 diff_alt_prog:
@@ -135,6 +155,46 @@ diff_alt_prog:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff source and alt source
+#
+diff_prog_alt:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
+# diff orig and alt
+#
+diff_orig_alt:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
+diff_alt_orig:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
 
 ###############
 # utility rules

1984/anonymous/Makefile

@@ -126,7 +126,8 @@ ALT_TARGET= ${PROG}.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -153,11 +154,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -165,6 +176,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1984/decot/Makefile

@@ -129,7 +129,8 @@ ALT_TARGET= ${PROG}.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -155,11 +156,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -167,6 +178,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1984/laman/Makefile

@@ -124,7 +124,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -147,11 +148,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -159,6 +170,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1984/mullender/Makefile

@@ -123,7 +123,8 @@ ALT_TARGET= ${PROG}.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -154,11 +155,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -166,6 +177,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1985/Makefile

@@ -61,7 +61,8 @@ all:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 #
@@ -77,6 +78,11 @@ everything:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog:
@@ -91,6 +97,20 @@ diff_orig_prog:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff source and orig source
+#
+diff_prog_orig:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
 # diff alt source and source
 #
 diff_alt_prog:
@@ -105,6 +125,46 @@ diff_alt_prog:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff source and alt source
+#
+diff_prog_alt:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
+# diff orig and alt
+#
+diff_orig_alt:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
+diff_alt_orig:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
 
 ###############
 # utility rules

1985/applin/Makefile

@@ -123,7 +123,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -145,11 +146,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -157,6 +168,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1985/august/Makefile

@@ -124,7 +124,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -146,11 +147,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -158,6 +169,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1985/lycklama/Makefile

@@ -124,7 +124,8 @@ ALT_TARGET= ${PROG}.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -146,11 +147,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -158,6 +169,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1985/shapiro/Makefile

@@ -123,7 +123,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -148,11 +149,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -160,6 +171,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1985/sicherman/Makefile

@@ -124,7 +124,8 @@ ALT_TARGET= ${PROG}.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -146,11 +147,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -158,6 +169,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1986/Makefile

@@ -61,7 +61,8 @@ all:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -107,6 +108,11 @@ everything:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog:
@@ -121,6 +127,20 @@ diff_orig_prog:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff source and orig source
+#
+diff_prog_orig:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
 # diff alt source and source
 #
 diff_alt_prog:
@@ -135,6 +155,46 @@ diff_alt_prog:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff source and alt source
+#
+diff_prog_alt:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
+# diff orig and alt
+#
+diff_orig_alt:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
+diff_alt_orig:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
 
 ###############
 # utility rules

1986/applin/Makefile

@@ -125,7 +125,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -147,11 +148,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -159,6 +170,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1986/august/Makefile

@@ -125,7 +125,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -148,11 +149,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -160,6 +171,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1986/bright/Makefile

@@ -127,7 +127,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -149,11 +150,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -161,6 +172,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1986/hague/Makefile

@@ -125,7 +125,8 @@ ALT_TARGET= ${PROG}.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -149,11 +150,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -161,6 +172,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1986/holloway/Makefile

@@ -125,7 +125,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -147,11 +148,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -159,6 +170,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1986/marshall/Makefile

@@ -127,7 +127,8 @@ ALT_TARGET= ${PROG}.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -149,11 +150,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -161,6 +172,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1986/pawka/Makefile

@@ -123,7 +123,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -145,11 +146,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -157,6 +168,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1986/stein/Makefile

@@ -124,7 +124,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -148,11 +149,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -160,6 +171,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1986/wall/Makefile

@@ -128,7 +128,8 @@ ALT_TARGET= ${PROG}.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -153,11 +154,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -165,6 +176,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1987/Makefile

@@ -61,7 +61,8 @@ all:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -107,6 +108,11 @@ everything:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog:
@@ -121,6 +127,20 @@ diff_orig_prog:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff source and orig source
+#
+diff_prog_orig:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
 # diff alt source and source
 #
 diff_alt_prog:
@@ -135,6 +155,46 @@ diff_alt_prog:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff source and alt source
+#
+diff_prog_alt:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
+# diff orig and alt
+#
+diff_orig_alt:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
+diff_alt_orig:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
 
 ###############
 # utility rules

1987/biggar/Makefile

@@ -123,7 +123,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -147,11 +148,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -159,6 +170,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1987/heckbert/Makefile

@@ -124,7 +124,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -146,11 +147,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -158,6 +169,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1987/hines/Makefile

@@ -122,7 +122,8 @@ ALT_TARGET= ${PROG}.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -148,11 +149,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -160,6 +171,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1987/korn/Makefile

@@ -124,7 +124,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -146,11 +147,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -158,6 +169,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1987/lievaart/Makefile

@@ -125,7 +125,8 @@ ALT_TARGET= ${PROG}.alt ${PROG}2.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -158,11 +159,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -170,6 +181,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1987/wall/Makefile

@@ -138,7 +138,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -160,11 +161,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -172,6 +183,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1987/westley/Makefile

@@ -125,7 +125,8 @@ ALT_TARGET= ${PROG}.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -150,11 +151,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -162,6 +173,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1988/Makefile

@@ -61,7 +61,8 @@ all:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -107,6 +108,11 @@ everything:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog:
@@ -121,6 +127,20 @@ diff_orig_prog:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff source and orig source
+#
+diff_prog_orig:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
 # diff alt source and source
 #
 diff_alt_prog:
@@ -135,6 +155,46 @@ diff_alt_prog:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff source and alt source
+#
+diff_prog_alt:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
+# diff orig and alt
+#
+diff_orig_alt:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
+diff_alt_orig:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
 
 ###############
 # utility rules

1988/applin/Makefile

@@ -123,7 +123,8 @@ ALT_TARGET= applin.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -170,11 +171,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -182,6 +193,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1988/dale/Makefile

@@ -125,7 +125,8 @@ ALT_TARGET= ${PROG}.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -149,11 +150,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -161,6 +172,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1988/isaak/Makefile

@@ -126,7 +126,8 @@ ALT_TARGET= ${PROG}.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -152,11 +153,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -164,6 +175,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1988/litmaath/Makefile

@@ -123,7 +123,8 @@ ALT_TARGET= ${PROG}.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -145,11 +146,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -157,6 +168,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1988/phillipps/Makefile

@@ -126,7 +126,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -148,11 +149,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -160,6 +171,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1988/reddy/Makefile

@@ -124,7 +124,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -146,11 +147,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -158,6 +169,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1988/robison/Makefile

@@ -123,7 +123,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -145,11 +146,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -157,6 +168,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1988/spinellis/Makefile

@@ -122,7 +122,8 @@ ALT_TARGET= ${PROG}.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -153,11 +154,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -165,6 +176,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1988/westley/Makefile

@@ -124,7 +124,8 @@ ALT_TARGET= ${PROG}.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -146,11 +147,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -158,6 +169,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1989/Makefile

@@ -61,7 +61,8 @@ all:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -107,6 +108,11 @@ everything:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog:
@@ -121,6 +127,20 @@ diff_orig_prog:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff source and orig source
+#
+diff_prog_orig:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
 # diff alt source and source
 #
 diff_alt_prog:
@@ -135,6 +155,46 @@ diff_alt_prog:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff source and alt source
+#
+diff_prog_alt:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
+# diff orig and alt
+#
+diff_orig_alt:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
+diff_alt_orig:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
 
 ###############
 # utility rules

1989/fubar/Makefile

@@ -122,7 +122,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -146,11 +147,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -158,6 +169,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1989/jar.1/Makefile

@@ -122,7 +122,8 @@ ALT_TARGET= ${PROG}.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -157,11 +158,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -169,6 +180,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1989/jar.2/Makefile

@@ -125,7 +125,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -149,11 +150,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -161,6 +172,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1989/ovdluhe/Makefile

@@ -127,7 +127,8 @@ ALT_TARGET= ${PROG}.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -152,11 +153,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -164,6 +175,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1989/paul/Makefile

@@ -125,7 +125,8 @@ ALT_TARGET= ${PROG}.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -147,11 +148,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -159,6 +170,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1989/robison/Makefile

@@ -128,7 +128,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -151,11 +152,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -163,6 +174,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1989/roemer/Makefile

@@ -125,7 +125,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -147,11 +148,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -159,6 +170,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1989/tromp/Makefile

@@ -133,7 +133,8 @@ CINCLUDE+= -include stdio.h -include unistd.h -include stdlib.h
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -158,11 +159,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -170,6 +181,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1989/vanb/Makefile

@@ -123,7 +123,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -145,11 +146,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -157,6 +168,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1989/westley/Makefile

@@ -126,7 +126,8 @@ ALT_TARGET= ver0 ver1 ver2 ver3
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -168,11 +169,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -180,6 +191,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1990/Makefile

@@ -61,7 +61,8 @@ all:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -107,6 +108,11 @@ everything:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog:
@@ -121,6 +127,20 @@ diff_orig_prog:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff source and orig source
+#
+diff_prog_orig:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
 # diff alt source and source
 #
 diff_alt_prog:
@@ -135,6 +155,46 @@ diff_alt_prog:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff source and alt source
+#
+diff_prog_alt:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
+# diff orig and alt
+#
+diff_orig_alt:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
+diff_alt_orig:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
 
 ###############
 # utility rules

1990/baruch/Makefile

@@ -123,7 +123,8 @@ ALT_TARGET= ${PROG}.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -145,11 +146,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -157,6 +168,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1990/cmills/Makefile

@@ -127,7 +127,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -149,11 +150,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -161,6 +172,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1990/dds/Makefile

@@ -127,7 +127,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -149,11 +150,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -161,6 +172,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1990/dg/Makefile

@@ -123,7 +123,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -145,11 +146,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -157,6 +168,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1990/jaw/Makefile

@@ -127,7 +127,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -158,11 +159,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -170,6 +181,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1990/pjr/Makefile

@@ -123,7 +123,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -145,11 +146,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -157,6 +168,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1990/scjones/Makefile

@@ -124,7 +124,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -146,11 +147,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -158,6 +169,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1990/stig/Makefile

@@ -122,7 +122,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -144,11 +145,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -156,6 +167,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1990/tbr/Makefile

@@ -126,7 +126,8 @@ ALT_TARGET= ${PROG}.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -151,11 +152,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -163,6 +174,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1990/theorem/Makefile

@@ -129,7 +129,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -170,11 +171,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -182,6 +193,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1990/westley/Makefile

@@ -127,7 +127,8 @@ ALT_TARGET= ${PROG}.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -151,11 +152,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -163,6 +174,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1991/Makefile

@@ -61,7 +61,8 @@ all:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -107,6 +108,11 @@ everything:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog:
@@ -121,6 +127,20 @@ diff_orig_prog:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff source and orig source
+#
+diff_prog_orig:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
 # diff alt source and source
 #
 diff_alt_prog:
@@ -135,6 +155,46 @@ diff_alt_prog:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff source and alt source
+#
+diff_prog_alt:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
+# diff orig and alt
+#
+diff_orig_alt:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
+diff_alt_orig:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
 
 ###############
 # utility rules

1991/ant/Makefile

@@ -127,7 +127,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -149,11 +150,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -161,6 +172,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1991/brnstnd/Makefile

@@ -126,7 +126,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -148,11 +149,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -160,6 +171,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1991/buzzard/Makefile

@@ -127,7 +127,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -149,11 +150,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -161,6 +172,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1991/cdupont/Makefile

@@ -122,7 +122,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -144,11 +145,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -156,6 +167,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1991/davidguy/Makefile

@@ -128,7 +128,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -150,11 +151,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -162,6 +173,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1991/dds/Makefile

@@ -125,7 +125,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -147,11 +148,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -159,6 +170,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1991/fine/Makefile

@@ -124,7 +124,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -146,11 +147,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -158,6 +169,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1991/rince/Makefile

@@ -124,7 +124,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -146,11 +147,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -158,6 +169,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1991/westley/Makefile

@@ -128,7 +128,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -199,11 +200,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -211,6 +222,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1992/Makefile

@@ -62,7 +62,8 @@ all:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -108,6 +109,11 @@ everything:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog:
@@ -122,6 +128,20 @@ diff_orig_prog:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff source and orig source
+#
+diff_prog_orig:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
 # diff alt source and source
 #
 diff_alt_prog:
@@ -136,6 +156,46 @@ diff_alt_prog:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff source and alt source
+#
+diff_prog_alt:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
+# diff orig and alt
+#
+diff_orig_alt:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
+diff_alt_orig:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
 
 ###############
 # utility rules

1992/adrian/Makefile

@@ -131,7 +131,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -193,11 +194,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -205,6 +216,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1992/albert/Makefile

@@ -123,7 +123,8 @@ ALT_TARGET= ${PROG}.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -148,11 +149,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -160,6 +171,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1992/ant/Makefile

@@ -126,7 +126,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 	supernova deep_magic magic charon pluto
@@ -153,11 +154,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -165,6 +176,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1992/buzzard.1/Makefile

@@ -128,7 +128,8 @@ CPPCLEAN= ${GREP} -v '^. [0-9][0-9]*'
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -179,11 +180,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -191,6 +202,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1992/buzzard.2/Makefile

@@ -124,7 +124,8 @@ ALT_TARGET= ${PROG}.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -153,11 +154,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -165,6 +176,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1992/gson/Makefile

@@ -128,7 +128,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -154,11 +155,21 @@ data: ${DATA}
 everything: all alt
 
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -166,6 +177,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 ###############
 # utility rules
 ###############

1992/imc/Makefile

@@ -126,7 +126,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -148,11 +149,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -160,6 +171,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1992/kivinen/Makefile

@@ -124,7 +124,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -146,11 +147,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -158,6 +169,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1992/lush/Makefile

@@ -124,7 +124,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -150,11 +151,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -162,6 +173,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1992/marangon/Makefile

@@ -126,7 +126,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -148,11 +149,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -160,6 +171,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1992/nathan/Makefile

@@ -122,7 +122,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -144,11 +145,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -156,6 +167,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1992/vern/Makefile

@@ -126,7 +126,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -153,11 +154,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -165,6 +176,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1992/westley/Makefile

@@ -123,7 +123,8 @@ ALT_TARGET= ${PROG}.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -150,11 +151,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -162,6 +173,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1993/Makefile

@@ -62,7 +62,8 @@ all:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -108,6 +109,11 @@ everything:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog:
@@ -122,6 +128,20 @@ diff_orig_prog:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff source and orig source
+#
+diff_prog_orig:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
 # diff alt source and source
 #
 diff_alt_prog:
@@ -136,6 +156,46 @@ diff_alt_prog:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff source and alt source
+#
+diff_prog_alt:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
+# diff orig and alt
+#
+diff_orig_alt:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
+diff_alt_orig:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
 
 ###############
 # utility rules

1993/ant/Makefile

@@ -124,7 +124,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -154,11 +155,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -166,6 +177,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1993/cmills/Makefile

@@ -124,7 +124,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -150,11 +151,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -162,6 +173,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1993/dgibson/Makefile

@@ -124,7 +124,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -155,11 +156,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -167,6 +178,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1993/ejb/Makefile

@@ -124,7 +124,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -146,11 +147,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -158,6 +169,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1993/jonth/Makefile

@@ -130,7 +130,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -155,11 +156,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -167,6 +178,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1993/leo/Makefile

@@ -124,7 +124,8 @@ ALT_TARGET= mind
 all: data ${TARGET} ${ALT_TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -150,11 +151,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -162,6 +173,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1993/lmfjyh/Makefile

@@ -122,7 +122,8 @@ ALT_TARGET= ${PROG}.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -153,11 +154,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -165,6 +176,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1993/plummer/Makefile

@@ -124,7 +124,8 @@ ALT_TARGET= ${PROG}.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -150,11 +151,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -162,6 +173,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1993/rince/Makefile

@@ -126,7 +126,8 @@ ALT_TARGET= ${PROG}.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -152,11 +153,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -164,6 +175,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1993/schnitzi/Makefile

@@ -123,7 +123,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -146,11 +147,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -158,6 +169,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1993/vanb/Makefile

@@ -123,7 +123,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -145,11 +146,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -157,6 +168,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules

1994/Makefile

@@ -61,7 +61,8 @@ all:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -107,6 +108,11 @@ everything:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog:
@@ -121,6 +127,20 @@ diff_orig_prog:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff source and orig source
+#
+diff_prog_orig:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
 # diff alt source and source
 #
 diff_alt_prog:
@@ -135,6 +155,46 @@ diff_alt_prog:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
+# diff source and alt source
+#
+diff_prog_alt:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
+# diff orig and alt
+#
+diff_orig_alt:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
+diff_alt_orig:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${WINNERS} ; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && $(MAKE) $@)"; \
+	    (cd $$i && $(MAKE) $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
 
 ###############
 # utility rules

1994/dodsond1/Makefile

@@ -126,7 +126,8 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.PHONY: all alt data everything diff_orig_prog diff_alt_prog \
+.PHONY: all alt data everything diff_orig_prog diff_prog_orig \
+	diff_alt_prog diff_prog_alt diff_orig_alt diff_alt_orig \
 	clean clobber install love haste waste maker easter_egg \
 	sandwich supernova deep_magic magic charon pluto
 
@@ -148,11 +149,21 @@ data: ${DATA}
 everything: all alt
 	@${TRUE}
 
+
+#####################
+# make a difference #
+#####################
+#
 # diff orig source and source
 #
 diff_orig_prog: ${PROG}.orig.c ${PROG}.c
 	@-${DIFF} -u ${PROG}.orig.c ${PROG}.c
 
+# diff source and orig source
+#
+diff_prog_orig: ${PROG}.c ${PROG}.orig.c
+	@-${DIFF} -u ${PROG}.c ${PROG}.orig.c
+
 # diff alt source and source
 #
 diff_alt_prog: ${PROG}.c
@@ -160,6 +171,25 @@ diff_alt_prog: ${PROG}.c
 	    ${DIFF} -u ${PROG}.alt.c ${PROG}.c; \
 	fi
 
+# diff source and alt source
+#
+diff_prog_alt: ${PROG}.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.c ${PROG}.alt.c; \
+	fi
+
+# diff orig and alt
+#
+diff_orig_alt: ${PROG}.orig.c
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.orig.c ${PROG}.alt.c; \
+	fi
+
+diff_alt_orig:
+	@-if [[ -e ${PROG}.alt.c ]]; then \
+	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
+	fi
+
 
 ###############
 # utility rules