fix build

awk.Makefile

+# awk program that patches the Makefile generated by Coq.
+
+# Detect the name this project will be installed under.
+/\$\(COQLIBINSTALL\)\/.*\/\$\$i/ {
+# Wow, POSIX awk is really broken.  I mean, isn't it supposed to be a text processing language?
+# And there is not even a way to access the matched groups of a regexp...?!? Lucky enough,
+# we can just split the string at '/' here.
+	split($0, PIECES, /\//);
+	PROJECT=PIECES[2];
+}
+
+# Patch the uninstall target to work properly, and to also uninstall stale files.
+# Also see <https://coq.inria.fr/bugs/show_bug.cgi?id=4907>.
+/^uninstall:/ {
+	print "uninstall:";
+	print "\tif [ -d \"$$(DSTROOT)\"$$(COQLIBINSTALL)/"PROJECT"/ ]; then find \"$$(DSTROOT)\"$$(COQLIBINSTALL)/"PROJECT"/ -name \"*.vo\" -print -delete; fi";
+	getline;
+	next
+}
+
+# Patch vio2vo to (a) run "make quick" with the same number of jobs, ensuring
+# that the .vio files are up-to-date, and (b) only schedule vio2vo for those
+# files where the .vo is *older* than the .vio.
+/^vio2vo:/ {
+	print "vio2vo:";
+	print "\t@make -j $(J) quick"
+	print "\t@VIOFILES=$$(for file in $(VOFILES:%.vo=%.vio); do vofile=\"$$(echo \"$$file\" | sed \"s/\\.vio/.vo/\")\"; if [ \"$$vofile\" -ot \"$$file\" -o ! -e \"$$vofile\" ]; then echo -n \"$$file \"; fi; done); \\"
+	print "\t echo \"VIO2VO: $$VIOFILES\"; \\"
+	print "\t if [ -n \"$$VIOFILES\" ]; then $(COQC) $(COQDEBUG) $(COQFLAGS) -schedule-vio2vo $(J) $$VIOFILES; fi"
+	getline;
+	next
+}
+
+# This forwards all unchanged lines
+1