bittorrent (ports)

so I thought that I should update my install of BT, so I first deinstalled my old port and then made a clean install (make clean install). when I did so ports also installed a program called cairo, wich seems to be used for  graphical stuff. is cairo needed for bt, and is that why it installed it?

dude Cairo has nothing to do with BT - see http://en.wikipedia.org/wiki/Cairo_(graphics).  You using *BSD or Gentoo?