$OpenBSD: patch-Makefile_in,v 1.1 2012/08/22 09:55:01 edd Exp $

A construction that is not compatible with BSD grep.

--- Makefile.in.orig2	Sun Jun 17 22:55:39 2012
+++ Makefile.in	Sun Jun 17 22:56:39 2012
@@ -1179,7 +1179,7 @@ dist-hook:
 	find $(distdir) -name CVS -type d -prune -exec rm -rf {} \;
 
 graphviz_version.h: config.h
-	$(GREP) 'PACKAGE\|VERSION\|GVPLUGIN' config.h > graphviz_version.h
+	$(GREP) -E '(PACKAGE|VERSION|GVPLUGIN)' config.h > graphviz_version.h
 
 .PHONY: rpm
 rpm: dist
