asac

diff --git a/src/gnome-shell.in b/src/gnome-shell.in
index f1d5e0b..b875531 100755
--- a/src/gnome-shell.in
+++ b/src/gnome-shell.in
@@ -147,12 +147,13 @@ def start_shell():

     # Work around Ubuntu xulrunner bug,
     # http://bugzilla.gnome.org/show_bug.cgi?id=573413
-    pkgconfig = subprocess.Popen(['pkg-config', '--variable=sdkdir', 'mozilla-js'],
+    xulrunner = subprocess.Popen(['xulrunner', '--gre-version'],
                                  stdout=subprocess.PIPE)
-    mozjs_sdkdir = pkgconfig.communicate()[0].strip()
-    pkgconfig.wait()
-    if pkgconfig.returncode == 0:
-        mozjs_libdir = re.sub('-(sdk|devel)', '', mozjs_sdkdir)
+    xulrunner.wait()
+    gre_version = xulrunner.communicate()[0].strip()
+    mozjs_pkglibdir = "/usr/lib/xulrunner-" + gre_version
+    if xulrunner.returncode == 0:
+        mozjs_libdir = mozjs_pkglibdir
         if os.path.exists(mozjs_libdir + '/libmozjs.so'):
             env['LD_LIBRARY_PATH'] = os.environ.get('LD_LIBRARY_PATH', '') + ':' + mozjs_libdir