<p>I think the test failure is random and unrelated to the header include change (I should look into it, it's still clearly an issue, but I don't think it's related to your original issue).  <a href="https://github.com/mlpack/mlpack/commit/9c1bcf6d8a88d8b3e4271d96859bc843f244255c" class="commit-link"><tt>9c1bcf6</tt></a> was still a good change in my opinion, but it looks like the actual fix was adding <code>std::</code>.  Thanks for your help debugging this! :)</p>

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