--- graphviz-2.16.1-orig/lib/vpsc/csolve_VPSC.cpp	2007-08-14 16:25:04.000000000 -0600
+++ graphviz-2.16.1-orig/lib/vpsc/csolve_VPSC.cpp	2007-12-15 19:56:29.000000000 -0600
@@ -21,6 +21,7 @@ 
 #include <constraint.h>
 #include <generate-constraints.h>
 #include <solve_VPSC.h>
+#include <cstdlib>
 #include <cassert>
 #include "csolve_VPSC.h"
 extern "C" {
--- graphviz-2.16.1-orig/lib/vpsc/generate-constraints.cpp	2006-04-28 13:03:46.000000000 -0600
+++ graphviz-2.16.1-orig/lib/vpsc/generate-constraints.cpp	2007-12-15 19:56:11.000000000 -0600
@@ -18,6 +18,7 @@ 
 
 #include <set>
 #include <cassert>
+#include <cstdlib>
 #include "generate-constraints.h"
 #include "constraint.h"