I'm using QCAD2 quite a while now and after moving from FreeBSD-i386 to FreeBSD-amd64 there are some libraries missing in the 32 bit version (libXi and some more).
I'd strongly suggest making a 64 bit compilation of the pro version. The community edition does compile and run on FBSD-amd64 very well.
Maybe ths would better be posted to the suggestion list of the upcoming version 3 ...
Thanks for attention!