--- include/armadillo_bits/config.hpp.orig	2016-08-03 19:20:44 UTC
+++ include/armadillo_bits/config.hpp
@@ -32,13 +32,13 @@
 #endif
 
 #if !defined(ARMA_USE_ARPACK)
-// #define ARMA_USE_ARPACK
+#define ARMA_USE_ARPACK
 //// Uncomment the above line if you have ARPACK or a high-speed replacement for ARPACK.
 //// ARPACK is required for eigen decompositions of complex sparse matrices
 #endif
 
 #if !defined(ARMA_USE_SUPERLU)
-// #define ARMA_USE_SUPERLU
+#define ARMA_USE_SUPERLU
 //// Uncomment the above line if you have SuperLU.
 //// SuperLU is used for solving sparse linear systems via spsolve()
 //// Caveat: only SuperLU version 5.2 can be used!