diff -ruN xfce4-session.orig//patch_fix_gdm_lang.diff xfce4-session/patch_fix_gdm_lang.diff
--- xfce4-session.orig//patch_fix_gdm_lang.diff	1970-01-01 01:00:00.000000000 +0100
+++ xfce4-session/patch_fix_gdm_lang.diff	2011-05-18 00:40:07.568117593 +0200
@@ -0,0 +1,11 @@
+--- xfce4-session/main.c.orig	2011-05-18 00:17:48.472038642 +0200
++++ xfce4-session/main.c	2011-05-18 00:18:11.678579513 +0200
+@@ -103,7 +103,7 @@
+ 
+   /* this is for compatibility with the GNOME Display Manager */
+   lang = g_getenv ("GDM_LANG");
+-  if (lang != NULL)
++  if (lang != NULL && strlen (lang) >0)
+     {
+       xfce_setenv ("LANG", lang, TRUE);
+       xfce_unsetenv ("GDM_LANG");
diff -ruN xfce4-session.orig//PKGBUILD xfce4-session/PKGBUILD
--- xfce4-session.orig//PKGBUILD	2011-05-18 00:39:56.858175412 +0200
+++ xfce4-session/PKGBUILD	2011-05-18 00:40:05.008132719 +0200
@@ -4,7 +4,7 @@
 
 pkgname=xfce4-session
 pkgver=4.8.1
-pkgrel=2
+pkgrel=3
 pkgdesc="A session manager for Xfce"
 arch=('i686' 'x86_64')
 license=('GPL2')
@@ -28,7 +28,8 @@
          '5fa270637b5e685f033863d8664795a2')
 
 build() {
-  cd ${srcdir}/${pkgname}-${pkgver}
+  cd ${srcdir}/${pkgname}-${pkgver} 
+  patch -p0 < $startdir/patch_fix_gdm_lang.diff 
   ./configure --prefix=/usr \
 	--sysconfdir=/etc \
 	--libexecdir=/usr/lib/xfce4 \