Crap, I always forget fluid. You need:
sudo aptitude install fluid
[why that doesn't come as part of fltk-dev, I don't know... grrrr...]
You don't need fftw3; that's used to build a little tool for doing fourier transforms on the data after you've got data. You're welcome to build it in:
sudo aptitude install libfftw3-dev
If you have to ask what fourier transforms are, it means you don't need them :-)
zlib support is just so that obd2csv can gzip the csv it creates. Again, not needed but:
sudo aptitude install libz-dev
libftdi... you don't want that. That's a hack around crippled and/or broken kernels. If you're using mainline ubuntu, you're good.
BTPROTO_RFCOMM is used by obdsim to simulate a bluetooth OBDII device. Pretty much only useful to developers.
I think that's about that - overall... you need to install fluid but everything else should be perfectly ignorable.