<p>In <a href="https://github.com/mlpack/mlpack/pull/693#discussion_r66855931">src/mlpack/methods/neighbor_search/ns_model.hpp</a>:</p>
<pre style='color:#555'>> @@ -13,12 +13,24 @@
> #include <mlpack/core/tree/binary_space_tree.hpp>
> #include <mlpack/core/tree/cover_tree.hpp>
> #include <mlpack/core/tree/rectangle_tree.hpp>
> -
> +#include <boost/variant.hpp>
</pre>
<p>Should we add 'variant' to the list of Boost libraries we require in the documentation and in the root CMakeLists.txt?</p>
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