diff --git a/SConstruct b/SConstruct
index 8200055..e616958 100644
--- a/SConstruct
+++ b/SConstruct
@@ -2,7 +2,7 @@
 install_dir = '/usr/lib/gnome-screensaver/gnome-screensaver'
 
 env = Environment()
-env.ParseConfig("pkg-config --cflags --libs glib-2.0 gdk-2.0 atk gtk+-2.0")
+env.ParseConfig("pkg-config --cflags --libs glib-2.0 gdk-2.0 atk gtk+-2.0 gtkglext-1.0")
 
 dwss = env.Program('dwss', [Glob('*.c'), Glob('*.cc')])