<p>I think uncomment  <code>#define ARMA_USE_CXX11</code> instead should be a more reasonable solution.</p>

<p>reference: <a href="http://arma.sourceforge.net/docs.html#uword">http://arma.sourceforge.net/docs.html#uword</a></p>

<pre><code>when using the new C++11 / C++14 standards, the default width is 64 bits on 64-bit platforms (as of Armadillo 5.000)
</code></pre>

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