diff -up gts-0.7.6/examples/happrox.c.netpbm gts-0.7.6/examples/happrox.c
--- gts-0.7.6/examples/happrox.c.netpbm	2010-06-01 09:11:17.000000000 +0200
+++ gts-0.7.6/examples/happrox.c	2010-06-01 09:11:24.000000000 +0200
@@ -21,7 +21,7 @@
 #include <stdlib.h>
 #include <locale.h>
 #include <string.h>
-#include <pgm.h>
+#include <netpbm/pgm.h>
 #include "config.h"
 #ifdef HAVE_GETOPT_H
 #  include <getopt.h>