move some rules into 1337.mk

A number of rules have been moved from entry `Makefile`s into the
`1337.mk` include file to make it easier for these common rules to be
updated or modified globally (by modifying the `1337.mk` include file).

The entry level `Makefile`s are now similar in form to the
/Makefile.example](https://github.com/ioccc-src/mkiocccentry/blob/master/Makefile.example)
file from the other repo.

The following make rules were moved into the `1337.mk` include file:

- `make indent.c`
- `make install`
- `make diff_orig_prog`
- `make diff_prog_orig`
- `make diff_alt_prog`
- `make diff_prog_alt`

This simplifies the entry level `Makefile`s so that they mostly reflect
the specifics of the particular entry.

Mentioned in FAQ 4.2, that the make diff rules are in the `1337.mk` include file.

Fixed invalid TAB character in `faq.md`.

Removed `make clean` directives that removed `indent.c`.  This file is now
removed via `make indent_clean`, a clean rule that also removes `indent.c`.

Removed `make clobber` directives that removed sandwich,  This file is now
removed via `make indent_clobber`, a clean rule that also removes `sandwich`.

Added `make indent_clean` and `make indent_clobber` rules into the top level
`Makefile` and the year level `YYYY/Makefile`.

Performed `make quick_www` to accomplish the above and to test under macOS.

1992/Makefile

@@ -229,30 +229,6 @@ clobber:
 	done
 	@echo '=-=-= ${YEAR} complete make $@ =-=-='
 
-install:
-	@echo '=-=-= ${YEAR} begin make $@ =-=-='
-	@echo
-	@for i in ${ENTRIES}; do \
-	    echo "=-= start ${YEAR}/$$i =-="; \
-	    echo "(cd $$i && ${MAKE} $@)"; \
-	    (cd $$i && ${MAKE} $@); \
-	    echo "=-= end ${YEAR}/$$i =-="; \
-	    echo; \
-	done
-	@echo '=-=-= ${YEAR} complete make $@ =-=-='
-
-indent.c:
-	@echo '=-=-= ${YEAR} begin make $@ =-=-='
-	@echo
-	@for i in ${ENTRIES}; do \
-	    echo "=-= start ${YEAR}/$$i =-="; \
-	    echo "(cd $$i && ${MAKE} $@)"; \
-	    (cd $$i && ${MAKE} $@); \
-	    echo "=-= end ${YEAR}/$$i =-="; \
-	    echo; \
-	done
-	@echo '=-=-= ${YEAR} complete make $@ =-=-='
-
 genpath:
 	@echo '=-=-= IOCCC begin make $@ =-=-='
 	@${RM} -f .tmp.genpath
@@ -292,6 +268,63 @@ new_entry:
 	  ${FMT} | ${SED} -e '2,$$s/^/\t/' -e 's/$$/ \\/' -e '$$s/ \\//'
 
 
+########################
+# extended utility rules
+########################
+
+.PHONY: indent_clean indent_clobber
+
+# you may be able to misunderstand the source by reading indent.c
+#
+indent.c:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${ENTRIES}; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && ${MAKE} $@)"; \
+	    (cd $$i && ${MAKE} $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
+indent_clean: clean
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${ENTRIES}; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && ${MAKE} $@)"; \
+	    (cd $$i && ${MAKE} $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
+indent_clobber: indent_clean clobber
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${ENTRIES}; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && ${MAKE} $@)"; \
+	    (cd $$i && ${MAKE} $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
+install:
+	@echo '=-=-= ${YEAR} begin make $@ =-=-='
+	@echo
+	@for i in ${ENTRIES}; do \
+	    echo "=-= start ${YEAR}/$$i =-="; \
+	    echo "(cd $$i && ${MAKE} $@)"; \
+	    (cd $$i && ${MAKE} $@); \
+	    echo "=-= end ${YEAR}/$$i =-="; \
+	    echo; \
+	done
+	@echo '=-=-= ${YEAR} complete make $@ =-=-='
+
+
 ##################
 # 1337 hacker rulz
 ##################

1992/adrian/Makefile

@@ -134,10 +134,7 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.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
+.PHONY: all alt data everything clean clobber
 
 ${PROG}: ${PROG}.c
 	${CC} ${CFLAGS} $< -o $@ ${LDFLAGS}
@@ -179,58 +176,12 @@ everything: all alt
 	@${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
-	@-if [[ -e ${PROG}.alt.c ]]; then \
-	    ${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 and orig
-diff_alt_orig:
-	@-if [[ -e ${PROG}.alt.c ]]; then \
-	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
-	fi
-
-
 ###############
 # utility rules
 ###############
 #
 clean:
 	${RM} -f ${OBJ} ${ALT_OBJ}
-	@-if [ -f indent.c ]; then \
-	    echo ${RM} -f indent.c; \
-	    ${RM} -f indent.c; \
-	fi
 
 clobber: clean
 	${RM} -f ${TARGET} ${ALT_TARGET}
@@ -238,33 +189,6 @@ clobber: clean
 	${RM} -f adbasename adbasename.c adecho adecho.c adgrep adhead
 	${RM} -f adhead.c adrian adsleep adsleep.c adwc adwc.c
 	${RM} -f ad.alt.temp adwc.alt.c
-	@-if [ -e sandwich ]; then \
-	    ${RM} -f sandwich; \
-	    echo 'ate sandwich'; \
-	fi
-
-install:
-	@echo "Dr. Spock says that is not logical!"
-	@${TRUE}
-
-# you may be able to misunderstand the source by reading indent.c
-#
-indent.c: ${PROG}.c
-	@if which "${GINDENT}" >/dev/null 2>&1; then \
-	    echo ${RM} -f $@; \
-	    ${RM} -f $@; \
-	    echo "${GINDENT} < $< > $@"; \
-	    ${GINDENT} < $< > $@; \
-	elif which "${INDENT}" >/dev/null 2>&1; then \
-	    echo ${RM} -f $@; \
-	    ${RM} -f $@; \
-	    echo "${INDENT} < $< > $@"; \
-	    ${INDENT} < $< > $@; \
-	else \
-	    echo "no indent tool found, ident $< yourself, sorry"; \
-	    echo "exit 17"; \
-	    exit 17; \
-	fi
 
 
 ######################################

1992/albert/Makefile

@@ -128,10 +128,7 @@ ALT_TARGET= ${PROG}.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.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
+.PHONY: all alt data everything clean clobber
 
 ${PROG}: ${PROG}.c
 	${CC} ${CFLAGS} $< -o $@ ${LDFLAGS}
@@ -155,89 +152,16 @@ everything: all alt
 	@${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
-	@-if [[ -e ${PROG}.alt.c ]]; then \
-	    ${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 and orig
-diff_alt_orig:
-	@-if [[ -e ${PROG}.alt.c ]]; then \
-	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
-	fi
-
-
 ###############
 # utility rules
 ###############
 #
 clean:
 	${RM} -f ${OBJ} ${ALT_OBJ}
-	@-if [ -f indent.c ]; then \
-	    echo ${RM} -f indent.c; \
-	    ${RM} -f indent.c; \
-	fi
 
 clobber: clean
 	${RM} -f ${TARGET} ${ALT_TARGET}
 	${RM} -rf *.dSYM
-	@-if [ -e sandwich ]; then \
-	    ${RM} -f sandwich; \
-	    echo 'ate sandwich'; \
-	fi
-
-install:
-	@echo "Dr. Spock says that is not logical!"
-	@${TRUE}
-
-# you may be able to misunderstand the source by reading indent.c
-#
-indent.c: ${PROG}.c
-	@if which "${GINDENT}" >/dev/null 2>&1; then \
-	    echo ${RM} -f $@; \
-	    ${RM} -f $@; \
-	    echo "${GINDENT} < $< > $@"; \
-	    ${GINDENT} < $< > $@; \
-	elif which "${INDENT}" >/dev/null 2>&1; then \
-	    echo ${RM} -f $@; \
-	    ${RM} -f $@; \
-	    echo "${INDENT} < $< > $@"; \
-	    ${INDENT} < $< > $@; \
-	else \
-	    echo "no indent tool found, ident $< yourself, sorry"; \
-	    echo "exit 17"; \
-	    exit 17; \
-	fi
 
 
 ######################################

1992/ant/Makefile

@@ -128,10 +128,7 @@ ALT_TARGET= ${PROG}.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.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 \
+.PHONY: all alt data everything clean clobber
 	supernova deep_magic magic charon pluto
 
 ${PROG}: ${PROG}.c
@@ -170,104 +167,18 @@ everything: all alt am am.alt
 	@${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
-	@-if [[ -e ${PROG}.alt.c ]]; then \
-	    ${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 and orig
-diff_alt_orig:
-	@-if [[ -e ${PROG}.alt.c ]]; then \
-	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
-	fi
-
-
 ###############
 # utility rules
 ###############
 #
 clean:
 	${RM} -f ${OBJ} ${ALT_OBJ}
-	@-if [ -f indent.c ]; then \
-	    echo ${RM} -f indent.c; \
-	    ${RM} -f indent.c; \
-	fi
 
 clobber: clean
 	${RM} -f ${TARGET} ${ALT_TARGET}
 	${RM} -rf *.dSYM
 	${RM} -f am am.safe am.alt am.safe.alt ${PROG}.alt
 	${RM} -f node.* leaf.*
-	@-if [ -e sandwich ]; then \
-	    ${RM} -f sandwich; \
-	    echo 'ate sandwich'; \
-	fi
-
-am_clean:
-	rm -f ant.o am.o
-	@-if [ -f indent.c ]; then \
-	    echo ${RM} -f indent.c; \
-	    ${RM} -f indent.c; \
-	fi
-
-am_clobber: am_clean
-	rm -f am.safe
-
-am_alt_clobber:
-	rm -f am.safe.alt
-
-install:
-	@echo "Dr. Spock says that is not logical!"
-	@${TRUE}
-
-# you may be able to misunderstand the source by reading indent.c
-#
-indent.c: ${PROG}.c
-	@if which "${GINDENT}" >/dev/null 2>&1; then \
-	    echo ${RM} -f $@; \
-	    ${RM} -f $@; \
-	    echo "${GINDENT} < $< > $@"; \
-	    ${GINDENT} < $< > $@; \
-	elif which "${INDENT}" >/dev/null 2>&1; then \
-	    echo ${RM} -f $@; \
-	    ${RM} -f $@; \
-	    echo "${INDENT} < $< > $@"; \
-	    ${INDENT} < $< > $@; \
-	else \
-	    echo "no indent tool found, ident $< yourself, sorry"; \
-	    echo "exit 17"; \
-	    exit 17; \
-	fi
 
 
 ######################################

1992/buzzard.1/Makefile

@@ -131,10 +131,7 @@ CPPCLEAN= ${GREP} -v '^. [0-9][0-9]*'
 all: data ${TARGET}
 	@${TRUE}
 
-.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
+.PHONY: all alt data everything clean clobber
 
 ${PROG}: ${PROG}.c
 	${CC} ${CFLAGS} $< -o $@ ${LDFLAGS}
@@ -184,90 +181,17 @@ everything: all alt
 	@${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
-	@-if [[ -e ${PROG}.alt.c ]]; then \
-	    ${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 and orig
-diff_alt_orig:
-	@-if [[ -e ${PROG}.alt.c ]]; then \
-	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
-	fi
-
-
 ###############
 # utility rules
 ###############
 #
 clean:
 	${RM} -f ${OBJ} ${ALT_OBJ}
-	@-if [ -f indent.c ]; then \
-	    echo ${RM} -f indent.c; \
-	    ${RM} -f indent.c; \
-	fi
 
 clobber: clean
 	${RM} -f ${TARGET} ${ALT_TARGET}
 	${RM} -rf *.dSYM
 	${RM} -f babble.cppcb babble
-	@-if [ -e sandwich ]; then \
-	    ${RM} -f sandwich; \
-	    echo 'ate sandwich'; \
-	fi
-
-install:
-	@echo "Dr. Spock says that is not logical!"
-	@${TRUE}
-
-# you may be able to misunderstand the source by reading indent.c
-#
-indent.c: ${PROG}.c
-	@if which "${GINDENT}" >/dev/null 2>&1; then \
-	    echo ${RM} -f $@; \
-	    ${RM} -f $@; \
-	    echo "${GINDENT} < $< > $@"; \
-	    ${GINDENT} < $< > $@; \
-	elif which "${INDENT}" >/dev/null 2>&1; then \
-	    echo ${RM} -f $@; \
-	    ${RM} -f $@; \
-	    echo "${INDENT} < $< > $@"; \
-	    ${INDENT} < $< > $@; \
-	else \
-	    echo "no indent tool found, ident $< yourself, sorry"; \
-	    echo "exit 17"; \
-	    exit 17; \
-	fi
 
 
 ######################################

1992/buzzard.2/Makefile

@@ -128,10 +128,7 @@ ALT_TARGET= ${PROG}.alt first.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.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
+.PHONY: all alt data everything clean clobber
 
 ${PROG}: ${PROG}.c
 	${CC} ${CFLAGS} $< -o $@ ${LDFLAGS}
@@ -163,90 +160,17 @@ everything: all alt
 	@${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
-	@-if [[ -e ${PROG}.alt.c ]]; then \
-	    ${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 and orig
-diff_alt_orig:
-	@-if [[ -e ${PROG}.alt.c ]]; then \
-	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
-	fi
-
-
 ###############
 # utility rules
 ###############
 #
 clean:
 	${RM} -f ${OBJ} ${ALT_OBJ}
-	@-if [ -f indent.c ]; then \
-	    echo ${RM} -f indent.c; \
-	    ${RM} -f indent.c; \
-	fi
 
 clobber: clean
 	${RM} -f ${TARGET} ${ALT_TARGET}
 	${RM} -rf *.dSYM
 	${RM} -f first buzzard.2
-	@-if [ -e sandwich ]; then \
-	    ${RM} -f sandwich; \
-	    echo 'ate sandwich'; \
-	fi
-
-install:
-	@echo "Dr. Spock says that is not logical!"
-	@${TRUE}
-
-# you may be able to misunderstand the source by reading indent.c
-#
-indent.c: ${PROG}.c
-	@if which "${GINDENT}" >/dev/null 2>&1; then \
-	    echo ${RM} -f $@; \
-	    ${RM} -f $@; \
-	    echo "${GINDENT} < $< > $@"; \
-	    ${GINDENT} < $< > $@; \
-	elif which "${INDENT}" >/dev/null 2>&1; then \
-	    echo ${RM} -f $@; \
-	    ${RM} -f $@; \
-	    echo "${INDENT} < $< > $@"; \
-	    ${INDENT} < $< > $@; \
-	else \
-	    echo "no indent tool found, ident $< yourself, sorry"; \
-	    echo "exit 17"; \
-	    exit 17; \
-	fi
 
 
 ######################################

1992/gson/Makefile

@@ -133,10 +133,7 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.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
+.PHONY: all alt data everything clean clobber
 
 # We DISABLE THE OPTIMISER because when it's enabled in some conditions it
 # crashes.
@@ -163,90 +160,17 @@ 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
-	@-if [[ -e ${PROG}.alt.c ]]; then \
-	    ${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 and orig
-diff_alt_orig:
-	@-if [[ -e ${PROG}.alt.c ]]; then \
-	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
-	fi
-
 ###############
 # utility rules
 ###############
 #
 clean:
 	${RM} -f ${OBJ} ${ALT_OBJ}
-	@-if [ -f indent.c ]; then \
-	    echo ${RM} -f indent.c; \
-	    ${RM} -f indent.c; \
-	fi
 
 clobber: clean
 	${RM} -f ${TARGET} ${ALT_TARGET}
 	${RM} -rf *.dSYM
 	${RM} -f og words
-	@-if [ -e sandwich ]; then \
-	    ${RM} -f sandwich; \
-	    echo 'ate sandwich'; \
-	fi
-
-install:
-	@echo "Dr. Spock says that is not logical!"
-	@${TRUE}
-
-# you may be able to misunderstand the source by reading indent.c
-#
-indent.c: ${PROG}.c
-	@if which "${GINDENT}" >/dev/null 2>&1; then \
-	    echo ${RM} -f $@; \
-	    ${RM} -f $@; \
-	    echo "${GINDENT} < $< > $@"; \
-	    ${GINDENT} < $< > $@; \
-	elif which "${INDENT}" >/dev/null 2>&1; then \
-	    echo ${RM} -f $@; \
-	    ${RM} -f $@; \
-	    echo "${INDENT} < $< > $@"; \
-	    ${INDENT} < $< > $@; \
-	else \
-	    echo "no indent tool found, ident $< yourself, sorry"; \
-	    echo "exit 17"; \
-	    exit 17; \
-	fi
 
 
 ######################################

1992/imc/Makefile

@@ -130,10 +130,7 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.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
+.PHONY: all alt data everything clean clobber
 
 ${PROG}: ${PROG}.c
 	${CC} ${CFLAGS} $< -o $@ ${LDFLAGS}
@@ -154,89 +151,16 @@ everything: all alt
 	@${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
-	@-if [[ -e ${PROG}.alt.c ]]; then \
-	    ${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 and orig
-diff_alt_orig:
-	@-if [[ -e ${PROG}.alt.c ]]; then \
-	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
-	fi
-
-
 ###############
 # utility rules
 ###############
 #
 clean:
 	${RM} -f ${OBJ} ${ALT_OBJ}
-	@-if [ -f indent.c ]; then \
-	    echo ${RM} -f indent.c; \
-	    ${RM} -f indent.c; \
-	fi
 
 clobber: clean
 	${RM} -f ${TARGET} ${ALT_TARGET}
 	${RM} -rf *.dSYM
-	@-if [ -e sandwich ]; then \
-	    ${RM} -f sandwich; \
-	    echo 'ate sandwich'; \
-	fi
-
-install:
-	@echo "Dr. Spock says that is not logical!"
-	@${TRUE}
-
-# you may be able to misunderstand the source by reading indent.c
-#
-indent.c: ${PROG}.c
-	@if which "${GINDENT}" >/dev/null 2>&1; then \
-	    echo ${RM} -f $@; \
-	    ${RM} -f $@; \
-	    echo "${GINDENT} < $< > $@"; \
-	    ${GINDENT} < $< > $@; \
-	elif which "${INDENT}" >/dev/null 2>&1; then \
-	    echo ${RM} -f $@; \
-	    ${RM} -f $@; \
-	    echo "${INDENT} < $< > $@"; \
-	    ${INDENT} < $< > $@; \
-	else \
-	    echo "no indent tool found, ident $< yourself, sorry"; \
-	    echo "exit 17"; \
-	    exit 17; \
-	fi
 
 
 ######################################

1992/kivinen/Makefile

@@ -130,10 +130,7 @@ ALT_TARGET= ${PROG}.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.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
+.PHONY: all alt data everything clean clobber
 
 ${PROG}: ${PROG}.c
 	${CC} ${CFLAGS} $< -o $@ ${LDFLAGS}
@@ -162,89 +159,16 @@ everything: all alt
 	@${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
-	@-if [[ -e ${PROG}.alt.c ]]; then \
-	    ${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 and orig
-diff_alt_orig:
-	@-if [[ -e ${PROG}.alt.c ]]; then \
-	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
-	fi
-
-
 ###############
 # utility rules
 ###############
 #
 clean:
 	${RM} -f ${OBJ} ${ALT_OBJ}
-	@-if [ -f indent.c ]; then \
-	    echo ${RM} -f indent.c; \
-	    ${RM} -f indent.c; \
-	fi
 
 clobber: clean
 	${RM} -f ${TARGET} ${ALT_TARGET}
 	${RM} -rf *.dSYM
-	@-if [ -e sandwich ]; then \
-	    ${RM} -f sandwich; \
-	    echo 'ate sandwich'; \
-	fi
-
-install:
-	@echo "Dr. Spock says that is not logical!"
-	@${TRUE}
-
-# you may be able to misunderstand the source by reading indent.c
-#
-indent.c: ${PROG}.c
-	@if which "${GINDENT}" >/dev/null 2>&1; then \
-	    echo ${RM} -f $@; \
-	    ${RM} -f $@; \
-	    echo "${GINDENT} < $< > $@"; \
-	    ${GINDENT} < $< > $@; \
-	elif which "${INDENT}" >/dev/null 2>&1; then \
-	    echo ${RM} -f $@; \
-	    ${RM} -f $@; \
-	    echo "${INDENT} < $< > $@"; \
-	    ${INDENT} < $< > $@; \
-	else \
-	    echo "no indent tool found, ident $< yourself, sorry"; \
-	    echo "exit 17"; \
-	    exit 17; \
-	fi
 
 
 ######################################

1992/lush/Makefile

@@ -128,10 +128,7 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.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
+.PHONY: all alt data everything clean clobber
 
 ${PROG}: ${PROG}.c
 	${CC} ${CFLAGS} $< -o $@ ${LDFLAGS}
@@ -156,48 +153,6 @@ everything: all alt
 	@${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
-	@-if [[ -e ${PROG}.alt.c ]]; then \
-	    ${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 and orig
-diff_alt_orig:
-	@-if [[ -e ${PROG}.alt.c ]]; then \
-	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
-	fi
-
-
 ###############
 # utility rules
 ###############
@@ -205,41 +160,10 @@ diff_alt_orig:
 clean:
 	${RM} -f ${OBJ} ${ALT_OBJ}
 	${RM} -f lush.again
-	@-if [ -f indent.c ]; then \
-	    echo ${RM} -f indent.c; \
-	    ${RM} -f indent.c; \
-	fi
 
 clobber: clean
 	${RM} -f ${TARGET} ${ALT_TARGET}
 	${RM} -rf *.dSYM
-	@-if [ -e sandwich ]; then \
-	    ${RM} -f sandwich; \
-	    echo 'ate sandwich'; \
-	fi
-
-install:
-	@echo "Dr. Spock says that is not logical!"
-	@${TRUE}
-
-# you may be able to misunderstand the source by reading indent.c
-#
-indent.c: ${PROG}.c
-	@if which "${GINDENT}" >/dev/null 2>&1; then \
-	    echo ${RM} -f $@; \
-	    ${RM} -f $@; \
-	    echo "${GINDENT} < $< > $@"; \
-	    ${GINDENT} < $< > $@; \
-	elif which "${INDENT}" >/dev/null 2>&1; then \
-	    echo ${RM} -f $@; \
-	    ${RM} -f $@; \
-	    echo "${INDENT} < $< > $@"; \
-	    ${INDENT} < $< > $@; \
-	else \
-	    echo "no indent tool found, ident $< yourself, sorry"; \
-	    echo "exit 17"; \
-	    exit 17; \
-	fi
 
 
 ######################################

1992/marangon/Makefile

@@ -134,10 +134,7 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.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
+.PHONY: all alt data everything clean clobber
 
 ${PROG}: ${PROG}.c
 	${CC} ${CFLAGS} $< -o $@ ${LDFLAGS}
@@ -158,89 +155,16 @@ everything: all alt
 	@${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
-	@-if [[ -e ${PROG}.alt.c ]]; then \
-	    ${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 and orig
-diff_alt_orig:
-	@-if [[ -e ${PROG}.alt.c ]]; then \
-	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
-	fi
-
-
 ###############
 # utility rules
 ###############
 #
 clean:
 	${RM} -f ${OBJ} ${ALT_OBJ}
-	@-if [ -f indent.c ]; then \
-	    echo ${RM} -f indent.c; \
-	    ${RM} -f indent.c; \
-	fi
 
 clobber: clean
 	${RM} -f ${TARGET} ${ALT_TARGET}
 	${RM} -rf *.dSYM
-	@-if [ -e sandwich ]; then \
-	    ${RM} -f sandwich; \
-	    echo 'ate sandwich'; \
-	fi
-
-install:
-	@echo "Dr. Spock says that is not logical!"
-	@${TRUE}
-
-# you may be able to misunderstand the source by reading indent.c
-#
-indent.c: ${PROG}.c
-	@if which "${GINDENT}" >/dev/null 2>&1; then \
-	    echo ${RM} -f $@; \
-	    ${RM} -f $@; \
-	    echo "${GINDENT} < $< > $@"; \
-	    ${GINDENT} < $< > $@; \
-	elif which "${INDENT}" >/dev/null 2>&1; then \
-	    echo ${RM} -f $@; \
-	    ${RM} -f $@; \
-	    echo "${INDENT} < $< > $@"; \
-	    ${INDENT} < $< > $@; \
-	else \
-	    echo "no indent tool found, ident $< yourself, sorry"; \
-	    echo "exit 17"; \
-	    exit 17; \
-	fi
 
 
 ######################################

1992/nathan/Makefile

@@ -124,10 +124,7 @@ ALT_TARGET= ${PROG}.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.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
+.PHONY: all alt data everything clean clobber
 
 ${PROG}: ${PROG}.c
 	${CC} ${CFLAGS} $< -o $@ ${LDFLAGS}
@@ -152,89 +149,16 @@ everything: all alt
 	@${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
-	@-if [[ -e ${PROG}.alt.c ]]; then \
-	    ${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 and orig
-diff_alt_orig:
-	@-if [[ -e ${PROG}.alt.c ]]; then \
-	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
-	fi
-
-
 ###############
 # utility rules
 ###############
 #
 clean:
 	${RM} -f ${OBJ} ${ALT_OBJ}
-	@-if [ -f indent.c ]; then \
-	    echo ${RM} -f indent.c; \
-	    ${RM} -f indent.c; \
-	fi
 
 clobber: clean
 	${RM} -f ${TARGET} ${ALT_TARGET}
 	${RM} -rf *.dSYM
-	@-if [ -e sandwich ]; then \
-	    ${RM} -f sandwich; \
-	    echo 'ate sandwich'; \
-	fi
-
-install:
-	@echo "Dr. Spock says that is not logical!"
-	@${TRUE}
-
-# you may be able to misunderstand the source by reading indent.c
-#
-indent.c: ${PROG}.c
-	@if which "${GINDENT}" >/dev/null 2>&1; then \
-	    echo ${RM} -f $@; \
-	    ${RM} -f $@; \
-	    echo "${GINDENT} < $< > $@"; \
-	    ${GINDENT} < $< > $@; \
-	elif which "${INDENT}" >/dev/null 2>&1; then \
-	    echo ${RM} -f $@; \
-	    ${RM} -f $@; \
-	    echo "${INDENT} < $< > $@"; \
-	    ${INDENT} < $< > $@; \
-	else \
-	    echo "no indent tool found, ident $< yourself, sorry"; \
-	    echo "exit 17"; \
-	    exit 17; \
-	fi
 
 
 ######################################

1992/vern/Makefile

@@ -130,10 +130,7 @@ ALT_TARGET=
 all: data ${TARGET}
 	@${TRUE}
 
-.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
+.PHONY: all alt data everything clean clobber
 
 ${PROG}: ${PROG}.tmp.c
 	${CC} ${CFLAGS} $< -o $@ ${LDFLAGS}
@@ -159,90 +156,17 @@ everything: all alt
 	@${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
-	@-if [[ -e ${PROG}.alt.c ]]; then \
-	    ${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 and orig
-diff_alt_orig:
-	@-if [[ -e ${PROG}.alt.c ]]; then \
-	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
-	fi
-
-
 ###############
 # utility rules
 ###############
 #
 clean:
 	${RM} -f ${OBJ} ${ALT_OBJ}
-	@-if [ -f indent.c ]; then \
-	    echo ${RM} -f indent.c; \
-	    ${RM} -f indent.c; \
-	fi
 
 clobber: clean
 	${RM} -f ${TARGET} ${ALT_TARGET}
 	${RM} -rf *.dSYM
 	${RM} -f ${PROG}.tmp.c
-	@-if [ -e sandwich ]; then \
-	    ${RM} -f sandwich; \
-	    echo 'ate sandwich'; \
-	fi
-
-install:
-	@echo "Dr. Spock says that is not logical!"
-	@${TRUE}
-
-# you may be able to misunderstand the source by reading indent.c
-#
-indent.c: ${PROG}.c
-	@if which "${GINDENT}" >/dev/null 2>&1; then \
-	    echo ${RM} -f $@; \
-	    ${RM} -f $@; \
-	    echo "${GINDENT} < $< > $@"; \
-	    ${GINDENT} < $< > $@; \
-	elif which "${INDENT}" >/dev/null 2>&1; then \
-	    echo ${RM} -f $@; \
-	    ${RM} -f $@; \
-	    echo "${INDENT} < $< > $@"; \
-	    ${INDENT} < $< > $@; \
-	else \
-	    echo "no indent tool found, ident $< yourself, sorry"; \
-	    echo "exit 17"; \
-	    exit 17; \
-	fi
 
 
 ######################################

1992/westley/Makefile

@@ -127,10 +127,7 @@ ALT_TARGET= ${PROG}.alt
 all: data ${TARGET}
 	@${TRUE}
 
-.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
+.PHONY: all alt data everything clean clobber
 
 ${PROG}: ${PROG}.c
 	${CC} ${CFLAGS} $< -o $@ ${LDFLAGS}
@@ -167,90 +164,17 @@ everything: all alt
 	@${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
-	@-if [[ -e ${PROG}.alt.c ]]; then \
-	    ${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 and orig
-diff_alt_orig:
-	@-if [[ -e ${PROG}.alt.c ]]; then \
-	    ${DIFF} -u ${PROG}.alt.c ${PROG}.orig.c; \
-	fi
-
-
 ###############
 # utility rules
 ###############
 #
 clean:
 	${RM} -f ${OBJ} ${ALT_OBJ}
-	@-if [ -f indent.c ]; then \
-	    echo ${RM} -f indent.c; \
-	    ${RM} -f indent.c; \
-	fi
 
 clobber: clean
 	${RM} -f ${TARGET} ${ALT_TARGET} ${ALT_TARGET}2
 	${RM} -rf *.dSYM
 	${RM} -f whereami whereami.alt whereami.alt2
-	@-if [ -e sandwich ]; then \
-	    ${RM} -f sandwich; \
-	    echo 'ate sandwich'; \
-	fi
-
-install:
-	@echo "Dr. Spock says that is not logical!"
-	@${TRUE}
-
-# you may be able to misunderstand the source by reading indent.c
-#
-indent.c: ${PROG}.c
-	@if which "${GINDENT}" >/dev/null 2>&1; then \
-	    echo ${RM} -f $@; \
-	    ${RM} -f $@; \
-	    echo "${GINDENT} < $< > $@"; \
-	    ${GINDENT} < $< > $@; \
-	elif which "${INDENT}" >/dev/null 2>&1; then \
-	    echo ${RM} -f $@; \
-	    ${RM} -f $@; \
-	    echo "${INDENT} < $< > $@"; \
-	    ${INDENT} < $< > $@; \
-	else \
-	    echo "no indent tool found, ident $< yourself, sorry"; \
-	    echo "exit 17"; \
-	    exit 17; \
-	fi
 
 
 ######################################