This is a documentation bug. -m strict was removed from rapper as part of the Raptor V2 work. It's replacement is -f strict=true (default is -f strict=false)
I will update the help message Dave -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
