The patch has been taken from community and fixes build issue of

graphviz post ghostscript upgrade to 9.18

The details can be found in the following location

http://www.graphviz.org/mantisbt/view.php?id=2604

diff --git a/plugin/gs/gvloadimage_gs.c b/plugin/gs/gvloadimage_gs.c

index 4ed9b71..53be600 100644

--- a/plugin/gs/gvloadimage_gs.c

+++ b/plugin/gs/gvloadimage_gs.c

@@ -72,11 +72,11 @@ static void gs_error(GVJ_t * job, const char *name, const char *funstr, int err)

     assert (err < 0);

-    if (err >= e_VMerror) 

+    if (err >= gs_error_VMerror)

 	errsrc = "PostScript Level 1"; 

-    else if (err >= e_unregistered)

+    else if (err >= gs_error_unregistered)

 	errsrc = "PostScript Level 2";

-    else if (err >= e_invalidid)

+    else if (err >= gs_error_invalidid)

 	errsrc = "DPS error";

     else

 	errsrc = "Ghostscript internal error";