diff -U 2 -r vtun.orig/config.h.in vtun/config.h.in
--- vtun.orig/config.h.in	2008-01-04 19:23:05 +0200
+++ vtun/config.h.in	2008-01-04 19:34:20 +0200
@@ -65,4 +65,10 @@
 #undef HAVE_SHAPER
 
+/* define if you have Unix98 pseudoterminals */
+#undef HAVE_GETPT
+#undef HAVE_GRANTPT
+#undef HAVE_UNLOCKPT
+#undef HAVE_PTSNAME
+
 /* Release version and date */
 #undef VTUN_VER
diff -U 2 -r vtun.orig/generic/pty_dev.c vtun/generic/pty_dev.c
--- vtun.orig/generic/pty_dev.c	2008-01-04 19:23:05 +0200
+++ vtun/generic/pty_dev.c	2008-01-04 19:44:19 +0200
@@ -25,8 +25,10 @@
 #include <unistd.h>
 #include <fcntl.h>
-#include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
 #include <syslog.h>
+#define __USE_XOPEN
+#define __USE_GNU
+#include <stdlib.h>
 
 #include "vtun.h"