diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..7371114
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "vendor/glm"]
+	path = vendor/glm
+	url = https://github.com/g-truc/glm.git
diff --git a/configure b/configure
index 0893cfa..f6cc1c1 100755
--- a/configure
+++ b/configure
@@ -1,3 +1,9 @@
 #!/bin/sh
 
-cmake -DCMAKE_TOOLCHAIN_FILE="$EMSCRIPTEN/cmake/Modules/Platform/Emscripten.cmake"
+VENDOR="vendor"
+
+GLM="$VENDOR/glm"
+
+cmake \
+-DCMAKE_TOOLCHAIN_FILE="$EMSCRIPTEN/cmake/Modules/Platform/Emscripten.cmake" \
+-DGLM_INCLUDE_DIR="$GLM"
diff --git a/vendor/glm b/vendor/glm
new file mode 160000
index 0000000..0af2e05
--- /dev/null
+++ b/vendor/glm
@@ -0,0 +1 @@
+Subproject commit 0af2e05b1b456ef92c8424d5f85b36b973adf610