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.

2019/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
 ##################

2019/adamovsky/Makefile

@@ -131,10 +131,7 @@ CFLAGS+= -trigraphs
 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 $@ ${LDFLAGS}
@@ -168,89 +165,16 @@ everything: all alt
 	@${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
 
 
 ######################################

2019/burton/Makefile

@@ -125,10 +125,7 @@ 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 $@ ${LDFLAGS}
@@ -163,89 +160,16 @@ everything: all alt
 	@${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
 
 
 ######################################

2019/ciura/Makefile

@@ -125,10 +125,7 @@ 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
 
 
 ######################################

2019/diels-grabsch1/Makefile

@@ -125,10 +125,7 @@ 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 $@ ${LDFLAGS}
@@ -149,89 +146,16 @@ everything: all alt
 	@${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
 
 
 ######################################

2019/diels-grabsch2/Makefile

@@ -125,10 +125,7 @@ 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 $@ ${LDFLAGS}
@@ -149,89 +146,16 @@ everything: all alt
 	@${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
 
 
 ######################################

2019/dogon/Makefile

@@ -141,10 +141,7 @@ 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 $@ ${LDFLAGS}
@@ -168,89 +165,16 @@ everything: all alt
 	@${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
 
 
 ######################################

2019/duble/Makefile

@@ -136,10 +136,7 @@ OS_SET= Linux FreeBSD Darwin
 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}:
 	${MAKE} `${UNAME}`
@@ -225,90 +222,17 @@ 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 Darwin Darwin.alt FreeBSD FreeBSD.alt Linux Linux.alt
-	@-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
 
 
 ######################################

2019/endoh/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
 
 # We FORCE the use of -O0 -g even if someone overrides it because this entry is
 # a BACKTRACE QUINE and NEEDS debugging symbols.
@@ -158,90 +155,17 @@ 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} -rf ${TARGET}.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
 
 
 ######################################

2019/giles/Makefile

@@ -129,10 +129,7 @@ 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 $@ ${LDFLAGS}
@@ -153,89 +150,16 @@ everything: all alt
 	@${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
 
 
 ######################################

2019/karns/Makefile

@@ -139,10 +139,7 @@ OPT+= -O0
 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 FORCE the use of -O0 even if someone overrides it because this entry has
@@ -171,90 +168,17 @@ 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 tbfs
-	@-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
 
 
 ######################################

2019/lynn/Makefile

@@ -126,10 +126,7 @@ 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 $@ ${LDFLAGS}
@@ -150,90 +147,17 @@ everything: all alt
 	@${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 fib.c fib
-	@-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
 
 
 ######################################

2019/mills/Makefile

@@ -286,10 +286,7 @@ prog   = ${rnn1}
 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
 	text
 
 ${TARGET}: ${PROG}.c Makefile ${INPUTS}
@@ -337,58 +334,12 @@ everything: all alt
 	@${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
 
 cpclean:
 	${RM} -f cp*_*.*
@@ -398,33 +349,6 @@ clobber: clean cpclean
 	${RM} -rf *.dSYM
 	${RM} -f ${INPUTS}
 	${RM} -f ${OUTPUTS}
-	@-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
 
 
 ######################################

2019/poikola/Makefile

@@ -135,10 +135,7 @@ DOCS= poikola.tex
 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 the author stated that for GCC optimiser
 # level 0 gave correct output. With clang [0123s] works which suggests that
@@ -175,90 +172,17 @@ 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 poikola.aux poikola.log poikola.synctex.gz
-	@-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
 
 
 ######################################

2019/yang/Makefile

@@ -126,10 +126,7 @@ 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 $@ ${LDFLAGS}
@@ -150,89 +147,16 @@ everything: all alt
 	@${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
 
 
 ######################################