+### Remove GNU make implicit rules++## This speeds things up since we don't need to look for and stat() a+## "foo.c,v" every time a rule referring to "foo.c" is in play. See+## "make -p -f/dev/null | grep ^%::'".+%:: %,v+%:: RCS/%,v+%:: RCS/%+%:: s.%+%:: SCCS/s.%
`MAKEFLAGS += -r` should have the same effect (and more)