cmake always writes this into CMakeCache.txt: > //Boost python library (debug) > Boost_PYTHON_LIBRARY_DEBUG:FILEPATH=/usr/local/lib/libboost_python.so > > //Boost python library (release) > Boost_PYTHON_LIBRARY_RELEASE:FILEPATH=/usr/local/lib/libboost_python.so The library is actually /usr/local/lib/libboost_python3.so for python-3.X. devel/boost-python-libs should probably be made fully concurrent, and it should be /usr/local/lib/libboost_pythonN.N.so
I'll recreate with a better explanation.