diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 00000000..c070acb0
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "external/glm"]
+	path = external/glm
+	url = https://github.com/g-truc/glm
diff --git a/external/glm b/external/glm
new file mode 160000
index 00000000..1ad55c50
--- /dev/null
+++ b/external/glm
@@ -0,0 +1 @@
+Subproject commit 1ad55c5016339b83b7eec98c31007e0aee57d2bf