diff --git a/.gitmodules b/.gitmodules
index 93787e2..1d57181 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "glm"]
 	path = glm
 	url = git://github.com/g-truc/glm.git
+[submodule "glcxx"]
+    path = glcxx
+    url = git://github.com/holtrop/glcxx.git