Warnings are treated as fatal when building gnome-session, so this causes
an error when building with gcc as pid_t and int are not the same type.

Need to file upstream bug

--- gnome-session-3.16.0/gnome-session/gsm-dbus-client.c	2014-12-12 07:23:26.000000000 -0800
+++ gnome-session-3.16.0/gnome-session/gsm-dbus-client.c	2015-07-06 22:48:37.709502671 -0700
@@ -208,7 +208,7 @@
         retval = TRUE;
 
         g_debug ("uid = %d", uid);
-        g_debug ("pid = %d", pid);
+        g_debug ("pid = %d", (int) pid);
 
 out:
         g_clear_pointer (&uid_variant, (GDestroyNotify) g_variant_unref);