<p>We should do this in <code>src/mlpack/core/arma_extend/arma_extend.hpp</code> instead of in the AppVeyor configuration.  You can use the different macros that Windows defines to detect the operating system and compiler.  (I think they are called <code>_WIN32</code>, <code>_WIN64</code>, <code>_MSC_VER</code>, and similar.  Not exactly sure how they need to be used here, but it should not be too hard.)</p>

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