diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..93787e2
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "glm"]
+	path = glm
+	url = git://github.com/g-truc/glm.git
diff --git a/Makefile b/Makefile
index d81003d..70b366b 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,6 @@
 FILE := app
 TARGET := $(FILE)
+REPOS := glcxx glm
 
 CCFLAGS := $(shell sdl2-config --cflags)
 ifeq (MINGW,$(findstring MINGW,$(shell uname)))
@@ -12,10 +13,16 @@ endif
 LDFLAGS := $(LIBS) $(shell sdl2-config --libs)
 
 
-all:	$(TARGET)
+all: submodule_init $(TARGET)
 
 $(TARGET): $(FILE).cc
 	$(CXX) -o $(TARGET) $(CCFLAGS) $< $(LDFLAGS)
 
+.PHONY: submodule_init
+submodule_init:
+	@if [ ! -e glcxx ]; then \
+	  git submodule update --init; \
+	fi
+
 clean:
 	-rm -f $(TARGET) *~ *.o
diff --git a/glcxx b/glcxx
new file mode 160000
index 0000000..e0f6651
--- /dev/null
+++ b/glcxx
@@ -0,0 +1 @@
+Subproject commit e0f6651161cdb03f75ede1bde0e1ac49f097c414
diff --git a/glm b/glm
new file mode 160000
index 0000000..8f39bb8
--- /dev/null
+++ b/glm
@@ -0,0 +1 @@
+Subproject commit 8f39bb8730d45570384f3156eb0126b835024d69