I\'m having a similar problem. . .
I\'m running Mandrake 9.1 and I followed all instructions in the Linux How-to.

my output looks like this:

[shawn@ny-amherst8a-282 planeshift]$ ./psclient -verbose
Warning: Failed to load `gl3d\'; use \'-verbose\' argument for details.
Warning: Failed to load `gl3d\'; use \'-verbose\' argument for details.
WARNING: could not load plugin \'crystalspace.graphics3d.opengl\'
aws-debug: Couldn\'t find iGraphics2D plugin!!
psclient: No 3d driver (iGraphics3D) plugin!

if I do ./psclient-bin I get:
[shawn@ny-amherst8a-282 planeshift]$ ./psclient-bin
Xlib:  extension \"GLX\" missing on display \":0.0\".
Cannot use preferred GLX visual - Generic visual will be used.
Xlib:  extension \"GLX\" missing on display \":0.0\".
Graphics display does not support a generic visual with double buffer and depth buffer
Xlib:  extension \"GLX\" missing on display \":0.0\".
Graphics display does not provide double buffering
Xlib:  extension \"GLX\" missing on display \":0.0\".
Graphics display does not support a depth buffer
Xlib:  extension \"GLX\" missing on display \":0.0\".
Graphics display does not support at least 12 bit color
crystalspace.graphics3d.opengl: Error opening Graphics2D context.
ALERT: crystalspace.graphics3d.opengl: Error opening Graphics2D context.
Xlib:  extension \"GLX\" missing on display \":0.0\".
Cannot use preferred GLX visual - Generic visual will be used.
Xlib:  extension \"GLX\" missing on display \":0.0\".
Graphics display does not support a generic visual with double buffer and depth buffer
Xlib:  extension \"GLX\" missing on display \":0.0\".
Graphics display does not provide double buffering
Xlib:  extension \"GLX\" missing on display \":0.0\".
Graphics display does not support a depth buffer
Xlib:  extension \"GLX\" missing on display \":0.0\".
Graphics display does not support at least 12 bit color
block_size: 8192
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Mounting maps: dungeon hydlaa podium temple tower.
planeshift.application.client: Planeshift Molecular Blue
planeshift.application.client: This game uses Crystal Space Engine created by Jorrit and others
planeshift.application.client: 0.97 rdev [Unix-x86-GCC]
planeshift.application.client: Failed to init app!


by the way, if it helps I have an Nvidia TNT2. . .kinda shitty, but hey.