So you've got the source code and are looking to compile it so that it runs in sweet native glory.

Linux

You need ​SDL and the associated development packages. Once you've got those, simple navigate to the top-level directory of quagents and run "make".

Then, copy the .pk3 files into build/release-linux-*/quagents3/.

You should be able to run it now with the build/release-linux-*/ioquake3.* executable.

Mac OSX

There's another shell script to compile for OSX in the top level directory, and it seems to compile fine up until SDL. I don't think I did the right thing to install SDL. :( Maybe someone who has clocked more than 2 hours on a Mac in their life can help me on this one...

Windows

Working on it. Looks like the best solution is MinGW and the make. Try ​http://wiki.ioquake3.org/Building_ioquake3, and the ioquake3 readme.

Everthing Else

You're currently on your own, sorry. Give the makefile a shot and see what happens.