For path like 'C:\boost\boost_1_41_0', one must write 'C:\boost\boost\_1\_41\_0', or use protecting macros, like \ccc, or... \path itself!
For path like 'C:\boost\boost_1_41_0', one must write 'C:\boost\boost\_1\_41\_0', or use protecting macros, like \ccc, or... \path itself!