Support locating Boost under BOOST_DIR/lib
Support locating Boost under BOOST_DIR/lib

pieis2pi/Slic3r,curieos/Slic3r,curieos/Slic3r,alexrj/Slic3r,lordofhyphens/Slic3r,alexrj/Slic3r,lordofhyphens/Slic3r,alexrj/Slic3r,lordofhyphens/Slic3r,alexrj/Slic3r,curieos/Slic3r,lordofhyphens/Slic3r,lordofhyphens/Slic3r,alexrj/Slic3r,pieis2pi/Slic3r,lordofhyphens/Slic3r,curieos/Slic3r,alexrj/Slic3r,curieos/Slic3r,pieis2pi/Slic3r,pieis2pi/Slic3r,curieos/Slic3r,pieis2pi/Slic3r,pieis2pi/Slic3r