updated for version 7.0b
diff --git a/src/proto/gui_xmdlg.pro b/src/proto/gui_xmdlg.pro
index 4f88c2f..dc6655a 100644
--- a/src/proto/gui_xmdlg.pro
+++ b/src/proto/gui_xmdlg.pro
@@ -1,3 +1,3 @@
 /* gui_xmdlg.c */
-char_u *gui_xm_select_font __ARGS((char_u *current));
+extern char_u *gui_xm_select_font __ARGS((char_u *current));
 /* vim: set ft=c : */