It does compile with GCC, what can of error do you have ?
About openarena, you just have to put your q3ut4 dir or symbolic link into your ~/.openarena dir, then you start the game with openarena +set fs_game q3ut4, same ligne in XQF settings.

danyo has friends everywhere

i would say that probably right explantation is that the server is over-rised and must to kick you before you join, or he'll fall down...

I don't remember anymore. All I remember was that I thought of a very ambitious idea: make my own FPS, so I took ioq3's source,

IDK, I've never had much luck compiling stuff. Very often I download something that's supposed to be a release version of something, and it won't compile. So far, I've NEVER managed to compile a git snapshot (nor a svn) of anything.

I once tried compiling the kernel , it was compiling and compiling for hours... in the end I ended up interrupting the process... ahh, that was one epic fail. However, it didn't give any errors.

Cool idea =) I've never tried to code a FPS, but if I may give you an advice you should try coding a Mod first, for example a Q3 mod It will make you deal with more high-level concepts which is nice to see how FPS engine work.

It's not a matter of luck That means you probably need to install some (lib)*-dev packages to get it compile. Ask Unclefragger, he is the compiler guru here

You probably used a default .config file : sometimes it even compiles tape-reader drivers I used to compile my kernel with optimized .config on my sempron 3100+, it lasted about 5 minutes. You also can use distcc to use your bro's fast computer to help compiling accross the network

Ask Unclefragger, he is the compiler guru here

Btw, Svarox, how did you configure your mumble. I either don't get sound in mumble, or I don't get sound ingame.

ATM, I've got: input: ALSA [plughw], output: OSS (OK, this combination doesn't work at all). The best I managed was input: pulseaudio, output: ALSA [dmix].

Global warming is a lie!

OK, Ubuntu's repo doesn't really have OSS , only wrapper for OSS=>ALSA, so I downloaded .deb from OSS's site. It seems to work with OSS now: exaile + UrT have sound, also exaile + mplayer have both sound (via OSS all). I also reinstalled SDL to have sound via OSS instead of PulesAudio. I had sound in UrT while having mumble in the background.

It even worked after a kernel update.

I used PulseAudio because it works OOB and is not choppy (unlike ALSA sometimes), at least if there's no more than one application using sound at a time.