<p>Oh wow, it seems like what is happening here is that <code>src/mlpack/core/util/arma_config_check.hpp</code>, which exists to make sure that the value of <code>ARMA_64BIT_WORD</code> is the same at mlpack compile time as when something is built against mlpack, is trying to include <code>src/mlpack/core/util/arma_config.hpp</code> but instead <code>include/armadillo_bits/arma_config.hpp</code> is being included.  This is very weird behavior to me, but it could probably be fixed by moving <code>src/mlpack/core/util/arma_config.hpp</code> (and references to that) to <code>src/mlpack/core/util/arma_config_info.hpp</code>.</p>

<p>Is this error happening when you compile mlpack, or when you compile something that uses mlpack?</p>

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