X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?a=blobdiff_plain;f=Makefile;h=88cfc3b873c973fdd36bab1232b5e6de80edb954;hb=8492bec613122a6ef044417aab0c7d6d74ca03fe;hp=2e4d97defcf6bab0e0ec6f1ec454d22107ae211e;hpb=eb8b213f3111748479ad63428d42e5b7318a6337;p=topbloke-formulae.git

diff --git a/Makefile b/Makefile
index 2e4d97d..88cfc3b 100644
--- a/Makefile
+++ b/Makefile
@@ -6,11 +6,15 @@ default: final.pdf
 once:		revid.inc
 		pdflatex -halt-on-error article.tex </dev/null
 
-revid.inc:	.git-revid $(SRCS) Makefile
+GITDIR:=$(addsuffix /, $(shell git rev-parse --git-dir))
+HEADREF:=$(shell git symbolic-ref HEAD 2>/dev/null)
+HEADDEPS:=$(addprefix $(GITDIR), HEAD $(HEADREF))
+
+revid.inc:	.git-revid $(SRCS) Makefile $(HEADDEPS)
 		./$< >$@.new
 		cmp $@.new $@ || mv -f $@.new $@
 
-final.pdf: $(SRCS)
+final.pdf: $(SRCS) revid.inc
 		$(MAKE) once
 		$(MAKE) once
 		$(MAKE) once