--- graphviz-2.34.0.orig/Makefile.am
+++ graphviz-2.34.0/Makefile.am
@@ -31,7 +31,7 @@
 BUILT_SOURCES = $(top_builddir)/graphviz_version.h
 
 $(top_builddir)/graphviz_version.h: config.h
-	$(GREP) 'PACKAGE\|VERSION\|GVPLUGIN' config.h > $(top_builddir)/graphviz_version.h
+	$(EGREP) 'PACKAGE|VERSION|GVPLUGIN' config.h > $(top_builddir)/graphviz_version.h
 
 EXTRA_DIST = $(txt) $(html) graphviz.spec.in graphviz.spec \
 	autogen.sh config/depcomp config/config.rpath \
--- graphviz-2.34.0.orig/Makefile.in
+++ graphviz-2.34.0/Makefile.in
@@ -1242,7 +1242,7 @@
 	find $(distdir) -name CVS -type d -prune -exec rm -rf {} \;
 
 $(top_builddir)/graphviz_version.h: config.h
-	$(GREP) 'PACKAGE\|VERSION\|GVPLUGIN' config.h > $(top_builddir)/graphviz_version.h
+	$(EGREP) 'PACKAGE|VERSION|GVPLUGIN' config.h > $(top_builddir)/graphviz_version.h
 
 .PHONY: rpm
 rpm: dist