diff -r -u graphviz-2.38.0/lib/gvpr/Makefile.am src/lib/gvpr/Makefile.am
--- graphviz-2.38.0/lib/gvpr/Makefile.am	2014-04-13 13:40:25.000000000 -0700
+++ src/lib/gvpr/Makefile.am	2016-04-02 20:34:42.351125236 -0700
@@ -53,7 +53,7 @@
 mkdefs_SOURCES = mkdefs.c
 
 gdefs.h: $(top_srcdir)/lib/gvpr/gprdata mkdefs
-	./mkdefs gdefs.h < $(top_srcdir)/lib/gvpr/gprdata
+	touch gdefs.h
 
 EXTRA_DIST = $(man_MANS) $(pdf_DATA) gprdata mkdefs.c gdefs.h trie.c gvprlib.vcproj
 
diff -r -u graphviz-2.38.0/lib/gvpr/Makefile.in src/lib/gvpr/Makefile.in
--- graphviz-2.38.0/lib/gvpr/Makefile.in	2014-04-13 13:41:55.000000000 -0700
+++ src/lib/gvpr/Makefile.in	2016-04-02 20:35:14.926790938 -0700
@@ -1065,7 +1065,7 @@
 	- @GROFF@ -Tps -man $(srcdir)/gvpr.3 | @PS2PDF@ - - >gvpr.3.pdf
 
 gdefs.h: $(top_srcdir)/lib/gvpr/gprdata mkdefs
-	./mkdefs gdefs.h < $(top_srcdir)/lib/gvpr/gprdata
+	touch gdefs.h
 
 # Tell versions [3.59,3.63) of GNU make to not export all variables.
 # Otherwise a system limit (for SysV at least) may be exceeded.