--- graphviz-2.30.1.old/tclpkg/gv/Makefile.am	2013-02-14 13:27:39.000000000 +0000

+++ graphviz-2.30.1/tclpkg/gv/Makefile.am	2017-09-16 12:12:11.571092950 +0100

@@ -109,7 +109,7 @@

 libgv_ocaml_la_SOURCES = $(BASESOURCES) gv_dummy_init.c

 libgv_ocaml_la_LIBADD = $(BASELIBS) $(OCAML_LIBS)

 libgv_ocaml_la_LDFLAGS = -module -avoid-version

-libgv_ocaml_la_CPPFLAGS = $(BASECPPFLAGS) $(OCAML_INCLUDES)

+libgv_ocaml_la_CPPFLAGS = $(BASECPPFLAGS) $(OCAML_INCLUDES) -Dint64=int64_t

 gv.ml gv.mli: gv_ocaml.cpp

 gv_ocaml.cpp: gv.i

 	$(SWIG) -c++ -ocaml -o gv_ocaml.cpp $(srcdir)/gv.i