diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..774972e
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "lib"]
+	path = lib
+	url = https://gitlab.com/libeigen/eigen.git
diff --git a/lib b/lib
new file mode 160000
index 0000000..fee5d60
--- /dev/null
+++ b/lib
@@ -0,0 +1 @@
+Subproject commit fee5d60b502d3fbaa6ceb56557d3e3fdce0240ef