title: LAPACK and armadillo on ubuntu
body: <p>I've installed BLAS and LAPACK on my ubuntu and then Armadillo. In the <code>config.hpp</code> file the <code>ARMA_USE_LAPACK</code> is uncommented.
  Programs compile without errors.
  However, when I run them I get  <code>error: eig_sym(): use of LAPACK needs to be enabled</code>
  The only solution I managed to find suggest to uncomment that flag in <code>config.hpp</code> file, but it happens to be already on.
  Thank you for your help!</p>