<p>Is ARMA_USE_U64S64 enabled?  Take a look at armadillo_bits/config.hpp. If it isn't, try uncommenting it.  It seems odd that you're having that problem because the build systems don't need to do anything special to compile correctly.  It also seems odd to me because ARMA_USE_CXX11 (which should be enabled because mlpack needs a C++11 compiler) should imply ARMA_USE_U64S64.</p>

<p>What OS and compiler are you using, out of curiosity?</p>

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