In the SlackBuild for rtorrent, on line 52, "Slackbuild" should be "SlackBuild" (with a capital B) in two places. I think it's also worth noting that there is no SlackBuild for libtorrent (requirement of rtorrent) in the 12.1 repo. The one from 12.0 worked for me. In any case thanks for the really useful SlackBuilds! Pierce