call glutInit(), bug 11486
diff --git a/progs/demos/winpos.c b/progs/demos/winpos.c
index 3a1a19e..b58e330 100644
--- a/progs/demos/winpos.c
+++ b/progs/demos/winpos.c
@@ -100,6 +100,7 @@
 
 int main( int argc, char *argv[] )
 {
+   glutInit(&argc, argv);
    glutInitWindowPosition(0, 0);
    glutInitWindowSize(500, 500);
    glutInitDisplayMode( GLUT_RGB );