bash-3.1# make
===>  Verifying specs: torrent.>=11 curl.>=5 c crypto m ncurses sigc-2.0 ssl stdc++ z
Error: bad shared lib version /usr/local/lib/libtorrent.so.7.0 (torrent.>=11)
Error: bad shared lib version /usr/local/lib/libcurl.so.3.4 (curl.>=5)
Missing library for sigc-2.0
Fatal error
*** Error code 1

Stop in /usr/cvs/ports/net/rtorrent (line 1514 of /usr/ports/infrastructure/mk/bsd.port.mk).