Visit http://www.icculus.org/netradiant/ for further information.
Download:
http://akion.planetnexuiz.de/radiant1.4 ... ff.tar.bz2
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GtkRadiant 1.4 for linux Nexuiz installation guide
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Ok, so finally, here it is. Expect strong WorksForMeTM behaviour

Nah, it's not that difficult, and should proly work, but requires
some steps to do so.
I've included everything in the tarball, should work fine.
Ok, ok, nuff of the BS, how to do it???
First, GtkRadiant and q3map2 has some library dependencies. You need:
Fetched from directly The GtkRadiant readme:
- You need to have the full native Linux versions of the games we support.
(so first of all, get the latest version from
http://alientrap.org/nexuiz/index.php?module=downloads
and extract it to somewhere)
- Linux 2.4 kernel recommanded (old 2.2 and unstable kernels untested)
(comment: It works for sure with the 2.6 series too. Simply ignore this)
- glibc 2.1 or above (2.2 recommended)
- XFree86 4 with hardware accelerated OpenGL support (others untested)
(comment: Xorg is ok too. :F )
You need the following dynamic libraries:
* GTK+ 1.2 http://www.gtk.org
* zlib http://www.cdrom.com/pub/infozip/zlib/
* libxml2 http://xmlsoft.org/
* libpng http://www.libpng.org/pub/png/libpng.html
And you'll also need:
* libmhash2
for q3map2.
Install all these libraries (newer versions should work fine too)
Now, extract the GtkRadiant-1.4.tar.bz2 into
/opt
Yes, you've read it right, /opt.
Don't extract it to elsewhere, it won't work any other way.
To extract it there, you might need root privilegs.
Extract the q3map_2.5.16_linux_x86.tar.tar into
/opt/GtkRadiant-1.4/
This should overwrite the old q3map2, and replace it with a little bit newer version.
See readme inside the tarball for more info
Extract
/games
/nexuiz.game
global.pref
global.xlink
into /opt/GtkRadiant-1.4/
Now, you'll need some editing. We need to set up some paths. Open
/opt/GtkRadiant-1.4/games/nexuiz.game
in your favorite editor, and replace the obvious paths.
(for dummies: enginepath ="/to/your/nexuiz/directory/" and engine="nexuiz.sh you like to use")
Next, open:
/opt/GtkRadiant-1.4/nexuiz.game/local.pref
and edit the line:
<epair name="LastProject">/to/your/nexuiz/install/data/default_project.proj</epair>
to the obvious value.
Pheww, we're almost halfway now

Now, copy
/data
into your nexuiz install's data dir. You might also want to extract the *.shader the shaderlist.txt
files from Nexuiz's data package (/data/data********.pk3/scripts/)
We're almost done. The final step is required for q3map2, I've only found this workaround to solve
it's problem about not founding any map resources.
in your ~, create a the directories:
~/.q3a/baseq3/
and symlink all the content from nexuiz/data/ into it.
Now you should be ready to launch GtkRadiant 1.4 ready for Nexuiz:
$ /opt/GtkRadiant-1.4/./radiant
And "kiss your social-life bye-bye!"

Any questions you might have, head over to the editing section of the Nexuiz forums:
http://forums.alientrap.local/viewforum.php?f=2
Have fun mapping and playing Nexuiz!
[LDB]C.Brutail aka Cube0wL
Special thanks to KadaverJack for providing me GtkRadiant-1.4.tar.bz2
UPDATE:
I've had some issues with this method: if you had quake3 installed too, it got confused by the shaders symlinked into ~/.q3a , and soon the game crashed. But don't worry, this can be fixed too.
To fix it, you have to move away all your quake3 data form
~/.q3a
to another directory in your home, let's say to:
~/.quake3
Now all you have to do is to start quake3 with the following cvar in your command line:
+set fs_homepath ~/.quake3
This way quake3 will no longer seek for data in ~/.q3a, but in ~/.quake3