[Projects] vcs: cvs revert/cvs up -C doesn't work

~/src/bison-2 % cvs up -C data/glr.c [vcs] error: invalid option: -C ~/src/bison-2 % cvs up data/glr.c M data/glr.c ~/src/bison-2 % cvs revert data/glr.c [vcs] warn: unknown method revert! Unknown command: `revert'