Building Firefox problem, cairo related

[Enigma]

I am having problems building firefox from ports.
I have been following this guide: 
http://www.engr.colostate.edu/~reinholz/freebsd/freebsd.html#apps
to the letter and started to build firefox,
I was in the fluxbox gui at the time and building via
xterm. At which time I clicked on the xterm bar
at the bottom and it closed xterm. I'm guessing it
continued to build because I could see it in the 'ps'
command. When id suspected it had stopped I
tried the "firefox &" command in xterm and it said
[1] 52812