<p>In <a href="https://github.com/mlpack/mlpack/pull/729#discussion_r71532227">src/mlpack/core/dists/gamma_distribution.cpp</a>:</p>
<pre style='color:#555'>> @@ -0,0 +1,76 @@
> +/**
> + * @file gamma_distribution.cpp
> + * @author Yannis Mentekidis
> + *
> + * Implementation of the methods of GammaDistribution.
> + */
> +#include "gamma_distribution.hpp"
> +
> +#include <boost/math/special_functions/digamma.hpp>
> +#include <boost/math/special_functions/trigamma.hpp>
</pre>
<p>The travis build can't find this function. Why? Isn't boost::math a dependency of mlpack?</p>
<p>Or is it a new function added to a later version of boost?</p>
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