I hacked a lang/gcc34 to build on DragonFly. My brief tests show that at least C and C++ compilers are working as well. Note, that it's about current master only, it doesn't build on 2.2.
The idea is to remove gcc34 from the base after the next release. So please, if you are interested in having working gcc3, test it out and report problems. -- Hasso Tepper