Sparse is stable now, so Eigen/Eigen should include Sparse
diff --git a/Eigen/Eigen b/Eigen/Eigen
index 19b40ea..654c8dc 100644
--- a/Eigen/Eigen
+++ b/Eigen/Eigen
@@ -1,2 +1,2 @@
 #include "Dense"
-//#include "Sparse"
+#include "Sparse"