<p>Ok, thanks for the information.  Let's try something simple... can you compile the following program and execute it?</p>

<pre><code>#include &lt;armadillo&gt;

using namespace arma;

int main()
{
  mat x = randu&lt;mat&gt;(50, 50);

  vec e = eig_sym(x);
  cout &lt;&lt; "Eigenvalues:\n" &lt;&lt; e.t();  
}
</code></pre>

<p>You might have to fix silly problems since I didn't actually compile and test that.  But you should be able to compile with <code>g++ -std=c++11 test.cpp -larmadillo</code>.  If that compiles and you run it, do you again encounter a SIGILL?</p>

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