tcl84 on FreeBSD 6.2 make error (new user)

[Ben Madin]

G'day all,

I'm sorry but I am new to FreeBSD, and I am not sure what tcl84 is, but 
when I tried to install gdal, using portmanager after many hours it told 
me that tcl84 had an error, so that was that.

when I went to ports/lang/tcl84 and tried make install clean it didn't 
work either.

there were lots of errors like 
/usr/ports/lang/tcl84/work/tcl8.4.14/unix/libtcl84.so: undefined 
reference to 'sin' (or 'cos' or 'tan')

so I'm guessing that there is some mathematical thing that it needs, but 
nearly every package I have tried to build from ports seems to require 
this tcl at some point, so my first few days of FreeBSD are not going as 
well as I hoped... after much documentation searching and googling etc, 
I come to this point for help (at least on how to get more help)

cheers

Ben