X-Git-Url: https://git.dlugolecki.net.pl/?a=blobdiff_plain;f=Makefile.inc;h=dd724ba3fe1cf22ac74d16056f580cb6f11fadc0;hb=e4ccfb6a6f26881db3874841a5aa2c2201a9c4e0;hp=f86ad01d7b2867f6d5869c446567a5b52557c61a;hpb=33ba39ee5fcff8327cb2a14b8826eb22a40c3be2;p=gedcom-parse.git

diff --git a/Makefile.inc b/Makefile.inc
index f86ad01..dd724ba 100644
--- a/Makefile.inc
+++ b/Makefile.inc
@@ -1,4 +1,4 @@
-## File to include in other Makefile's, defining common commands
+## File to include in other Makefile's, defining common commands and rules
 # $Id$
 # $Name$
 
@@ -10,3 +10,14 @@ define replace-VERSION
   mv $$file.new $$file; \
   done
 endef
+
+%.tabgen.h:	%.tab.h
+	if [ ! -r $(srcdir)/$@ ] ; \
+	then \
+	  touch $(srcdir)/$@; \
+	fi
+	if ! diff -q $< $(srcdir)/$@ > /dev/null; \
+	then \
+	  rm $(srcdir)/$@; \
+	  cp $(srcdir)/$< $(srcdir)/$@; \
+	fi