diff --git a/lapack/double.cpp b/lapack/double.cpp
new file mode 100644
index 0000000..d86549e
--- /dev/null
+++ b/lapack/double.cpp
@@ -0,0 +1,17 @@
+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2009-2011 Gael Guennebaud <gael.guennebaud@inria.fr>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#define SCALAR        double
+#define SCALAR_SUFFIX d
+#define SCALAR_SUFFIX_UP "D"
+#define ISCOMPLEX     0
+
+#include "cholesky.cpp"
+#include "lu.cpp"
+#include "eigenvalues.cpp"