yaourt -S orxonox-svn
Autocompletion in ingameconsole doesn't work
Orxonox needs Tcl-8.5.2 to work correcly right now. You can download the Makepkg file from the official SVN repository.
Compile failed, xxx needs fPIC flag
Enet may need to rebuild using fPIC flag. Add -fPIC to the CFLAGS variable in /etc/makepkg.conf and rebuild the package. You can find the PKGBUILD in aur: http://aur.archlinux.org/packages.php?ID=8842