afni.nimh.nih.gov

I'm having trouble running the latest version of AFNI on OS X Yosemite.

When I type "afni" in the terminal, I get the following error:

[mac157049-2:LFMS/Analysis/scripts] mrd9035% afni
dyld: Library not loaded: /usr/X11/lib/libXt.6.dylib
Referenced from: /Users/mrd9035/abin/afni
Reason: image not found
Trace/BPT trap
[mac157049-2:LFMS/Analysis/scripts] mrd9035%


Any ideas on how to fix this would be much appreciated!!