diff --git a/api/graphics_impl_lib.C b/api/graphics_impl_lib.C
index 294fc1046e..dfe8bb0bcb 100644
--- a/api/graphics_impl_lib.C
+++ b/api/graphics_impl_lib.C
@@ -27,3 +27,8 @@ int boinc_get_init_data(APP_INIT_DATA& app_init_data) {
     return bmsp->boinc_get_init_data_hook(app_init_data);
 }
 
+#ifdef __GNUC__
+static volatile const char  __attribute__((unused)) *BOINCrcsid="$Id$";
+#else
+static volatile const char *BOINCrcsid="$Id$";
+#endif