diff --git a/opengl.babel b/opengl.babel
index f0e800a..a5dfe9c 100644
--- a/opengl.babel
+++ b/opengl.babel
@@ -8,4 +8,4 @@ license: "MIT"
 srcDir: "src"
 
 [Deps]
-requires: "nimrod > 0.9.2"
\ No newline at end of file
+requires: "nimrod > 0.9.2, x11"