main/boost1.79: replace boost1.78
ERROR: boost1.79-1.79.0-r0: trying to overwrite usr/bin/b2 owned by boost1.78-1.78.0-r1.
ERROR: boost1.79-1.79.0-r0: trying to overwrite usr/bin/bcp owned by boost1.78-1.78.0-r1.
ERROR: boost1.79-1.79.0-r0: trying to overwrite usr/bin/bjam owned by boost1.78-1.78.0-r1.