<p>In <a href="https://github.com/mlpack/mlpack/pull/693#discussion_r67223989">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>but we don't have to add boost::variant to required libraries?? Even if its header only we need to make sure the headers are present. Or is it the part of basic boost which is included in every boost package?? I mean if I install just boost::math in ubuntu with apt-get do I get boost::variant??</p>
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