add stubs for XGL_WSI_X11
diff --git a/xgl-generate.py b/xgl-generate.py
index 16698b5..900f50c 100755
--- a/xgl-generate.py
+++ b/xgl-generate.py
@@ -36,8 +36,8 @@
         self.headers = ()
 
     def run(self):
-        self.protos = xgl.core
-        self.headers = xgl.core_headers
+        self.protos = xgl.core + xgl.ext_wsi_x11
+        self.headers = xgl.core_headers + xgl.ext_wsi_x11_headers
         print(self.generate())
 
     def generate(self):