I'm running Fedora 16 x64. When I ran quake2world, I got this:
[bart@beast quake2world]$ bin/quake2world
bash: bin/quake2world: /lib/ld-linux-x86-64.so.2: bad ELF interpreter: No such file or directory
I compiled it fine from SVN after this. Just pointing out an issue with the installer.
Doh! Can you pop by IRC? I'm not sure who updated the Linux build last.. perhaps WickedShell or maci will know. It's possible that WickedShell updated it with a 32 bit build by mistake.
So the Linux build has been updated (and verified by BartK) using a Debian 64 bit VM. All you need to have installed yourself is libSDL-image, libSDL-mixer, libjpeg, and libcurl.