add lapack interface to real symmetric eigenvalue dec and enable building of the lapack shared library
diff --git a/lapack/double.cpp b/lapack/double.cpp
index 5f7b9d1..4472357 100644
--- a/lapack/double.cpp
+++ b/lapack/double.cpp
@@ -29,3 +29,4 @@
 
 #include "cholesky.cpp"
 #include "lu.cpp"
+#include "eigenvalues.cpp"