X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?p=topbloke-formulae.git;a=blobdiff_plain;f=Makefile;h=2e4d97defcf6bab0e0ec6f1ec454d22107ae211e;hp=8bd84b3ea7214db1a1719fad188214b3a10cbfd9;hb=eb8b213f3111748479ad63428d42e5b7318a6337;hpb=0a0e7dc7722547a9ae7f9f30de4a98d0260c905a

diff --git a/Makefile b/Makefile
index 8bd84b3..2e4d97d 100644
--- a/Makefile
+++ b/Makefile
@@ -3,9 +3,13 @@ SRCS := $(wildcard *.tex)
 
 default: final.pdf
 
-once:
+once:		revid.inc
 		pdflatex -halt-on-error article.tex </dev/null
 
+revid.inc:	.git-revid $(SRCS) Makefile
+		./$< >$@.new
+		cmp $@.new $@ || mv -f $@.new $@
+
 final.pdf: $(SRCS)
 		$(MAKE) once
 		$(MAKE) once
@@ -16,4 +20,4 @@ final.pdf: $(SRCS)
 		pdftops $*.pdf $*.ps
 
 clean:
-	rm -f *.aux *.log *.dvi *.out *.pdf *~
+	rm -f *.aux *.log *.dvi *.out *.pdf *.ps *~