It somehow does not recognize fribidi, but it is being detected by cmake.
Mh. Actually, you are correct, full screen mode is not really full (but I assume it's how the game should look like :p)  and I'm not able to turn shaders on, but everything else works. Also, according to otool, the game requires fribidi shared library, which is not bundled with OS X. Users would be required to use MacPorts and fixing this goes beyond my knowledge, I can just point you to include static version of fribidi to mac binary.
When you achieve to fix it, I'll be glad to be your osx builder :>
 - http://dl.dropbox.com/u/1324224/mars_fullscreen.png
I discovered another bug: keys like ctrl, shift, option, backspace do not work. I can't bind them, nor use them in text fields.
Well.. they work on linux and windows, so it's due to the very basic sfml2 port... hopefully they'll will work in a future release of sfml2...