to3d works fine, but here's the command line output when I type "afni":

GPL AFNI: Analysis of Functional NeuroImages, by RW Cox (rwcox@nih.gov)
This is Version AFNI_2005_09_06_0927
[[Precompiled binary linux_gcc32: Oct 26 2005]]

** This software was designed to be used only for research purposes. **
** Clinical uses are not recommended, and have never been evaluated. **
** This software comes with no warranties of any kind whatsoever, **
** and may not be useful for anything. Use it at your own risk! **
** If these terms are not acceptable, you aren't allowed to use AFNI.**
** See 'Define Datamode->Misc->License Info' for more details. **

Thanks go to RM Birn for caloric input

Initializing: X11.. Widgets...... Input files:
session # 1 = /local/afni/ ==> 4 datasets
dataset count = 4
Time series = 0 files read
** Can't find anat parent PPC_ORgtdWt9YsZTUKhSEC2B6g of /local/afni/TT_N27+tlrc.HEAD
** Can't find anat parent RWC_HZ6leNMfKwp10iTTg78zaA of /local/afni/TT_icbm452+tlrc.HEAD
NLfit & NLerr= Found 32 modelsplug_nlfit Error: Must have noise parameter min cnstrnts <= max cnstrnts

*** Can't load NLfit plugin! ***


*** Warning: Plugin 3D Dump98 compile date=Nov 30 1999 predates AFNI=Oct 26 2005
*** Warning: Plugin 3D Correlation compile date=Nov 30 1999 predates AFNI=Oct 26 2005
*** Warning: Plugin 4D Dump compile date=Nov 30 1999 predates AFNI=Oct 26 2005
*** Warning: Plugin 3D Cluster compile date=Nov 30 1999 predates AFNI=Oct 26 2005
*** Warning: Plugin BRIK Compressor compile date=Nov 30 1999 predates AFNI=Oct 26 2005
*** Warning: Plugin Coord Order compile date=Nov 30 1999 predates AFNI=Oct 26 2005
*** Warning: Plugin Dataset Copy compile date=Nov 30 1999 predates AFNI=Oct 26 2005
*** Warning: Plugin Deconvolution compile date=Nov 30 1999 predates AFNI=Oct 26 2005
*** Warning: Plugin Hilbert Delay98 compile date=Nov 30 1999 predates AFNI=Oct 26 2005
*** Warning: Plugin Draw Dataset compile date=Nov 30 1999 predates AFNI=Oct 26 2005
*** Warning: Plugin 3D Edit compile date=Nov 30 1999 predates AFNI=Oct 26 2005
*** Warning: Plugin 3D+t Extract compile date=Nov 30 1999 predates AFNI=Oct 26 2005
*** Warning: Plugin Fourier Stuff compile date=Nov 30 1999 predates AFNI=Oct 26 2005
*** Warning: Plugin Hemi-subtract compile date=Nov 30 1999 predates AFNI=Oct 26 2005
*** Warning: Plugin Histogram compile date=Nov 30 1999 predates AFNI=Oct 26 2005
*** Warning: Plugin Histogram: CC compile date=Nov 30 1999 predates AFNI=Oct 26 2005
*** Warning: Plugin 2D Registration compile date=Nov 30 1999 predates AFNI=Oct 26 2005
*** Warning: Plugin LSqFit & Dtr compile date=Nov 30 1999 predates AFNI=Oct 26 2005
*** Warning: Plugin TS Generate compile date=Nov 30 1999 predates AFNI=Oct 26 2005
*** Warning: Plugin Expr 0D compile date=Nov 30 1999 predates AFNI=Oct 26 2005
*** Warning: Plugin ROI Average compile date=Nov 30 1999 predates AFNI=Oct 26 2005
*** Warning: Plugin maskcalc compile date=Nov 30 1999 predates AFNI=Oct 26 2005
*** Warning: Plugin Maxima compile date=Nov 30 1999 predates AFNI=Oct 26 2005
*** Warning: Plugin NLfit & NLerr compile date=Nov 30 1999 predates AFNI=Oct 26 2005
NLfit & NLerr= Found 32 modelsplug_nlfit Error: Noise model Constant improperly defined.