I'm looking to use ZeroRadiant to work on ubuntu, it's to create maps on urban terror, I know that works on windows and mac. I found this HOWTO but could not make it work.

I've got stock on this when I do.

~/ZeroRadiant-src$ scons target=radiant,q3map2 config=release

at the end shows me this:

collect2: ld returned 1 exit status
scons: *** [build/release/radiant/radiant.bin] Error 1
scons: building terminated because of errors.

there's a note on the how to that says:

If you get other errors, you may try asking for help in the GtkRadiant IRC channel, which is listed on the main ZeroRadiant page.

the page does not there and I could find that IRC channel.

EDIT thanks to @jokerdino in the chat sow me this

If you have the proprietary NVIDIA driver installed and you get the following error when executing the build target above:

/usr/bin/ld: cannot find -lGL
collect2: ld returned 1 exit status
scons: *** [build/release/radiant/radiant.bin] Error 1
scons: building terminated because of errors.

then you should install one of the nvidia-glx-dev* packages as mentioned above in Step A, then try to execute the main build target to compile GtkRadiant again.

I don't have nvidia; I do have ATI AMD Radeon HD 6320, and looks like it works.

  GL_VERSION:  4.1.11251 Compatibility Profile Context
  GL_VENDOR:   ATI Technologies Inc.
  GL_RENDERER: AMD Radeon HD 6320 Graphics

I'm think I do have video issues but.. how do I detect this? how can I continue?