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In Mac, even after gcc is installed from homebrew, gcc and g++ still point to clang's version. Need to update the make/config.mk file to point the gcc and g++ compliers to the version installed by homebrew. More details can be found in this blog: https://www.ibm.com/developerworks/community/blogs/jfp/entry/Installing_XGBoost_on_Mac_OSX?lang=en
The document of xgboost is generated with recommonmark and sphinx. You can build it locally by typing "make html" in this folder. - clone https://github.com/tqchen/recommonmark to root - type make html Checkout https://recommonmark.readthedocs.org for guide on how to write markdown with extensions used in this doc, such as math formulas and table of content.