update: i checked frenzy (based on 6.1) and found that it doesn't have libgcc_s.
from what i gather libgcc_s.so.1 (along with libgcc.a) is low-level gcc runtime library that implements some processor specific routines. as such i couldn't find any other documentation for it.
i think the problem is that this port of mysql is not supported on your fbsd version. (though it may only require some tweaking to build it.)
so, i would suggest that you upgrade your OS to fbsd7.
(btw, i take back my words, your system is probably not broken.
)