diff --git a/Rsconscript b/Rsconscript
index 2758a02..767264a 100644
--- a/Rsconscript
+++ b/Rsconscript
@@ -1,5 +1,7 @@
 configure do
   check_d_compiler
+  check_lib "X11"
+  check_lib "GLX"
 end
 
 build do