--- graphviz-2.12/contrib/diffimg/Makefile.am.orig
+++ graphviz-2.12/contrib/diffimg/Makefile.am
@@ -11,7 +11,7 @@
 
 diffimg_SOURCES = diffimg.c
 
-if WITH_LIBGD
+if WITH_MYLIBGD
 diffimg_LDADD = $(top_builddir)/lib/gd/libgvgd_C.la \
 	@FC_LIBS@ @FT_LIBS@ @JPEG_LIBS@ @PNG_LIBS@ @Z_LIBS@ @MATH_LIBS@
 else