[mlpack-git] [mlpack] Linking errors in building mlpack in Mac OS X (#442)

[ttuethao]

OK, I think the problem may be because macports-boost was built via clang (probably related to this http://stackoverflow.com/questions/29354201/linking-error-for-boostprogram-options). I rebuilt boost via gnu compilers and it works now.  So this seems to be down to the incompatibility between clang and gnu. 

Thank you, rcurtin!

PS: another not related (but maybe useful) remark  for those who want to install g++ in mac (I prefer gnu compilers because they seem to give faster programs and also support omp): one has to specify the build-in libraries for g++ and gcc correctly, since clang has the same library names in /usr/lib, which do not  have some standard symbols for g++ (such as std::basic_string, etc.) This can be a problem when linking to mlpack dependencies because the libxml2 often lives in the same folder as clang's libraries. 

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https://github.com/mlpack/mlpack/issues/442#issuecomment-112370037
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