afni.nimh.nih.gov

... and I see that part of the confusion might be due to the fact that we didn't list the CentOS-specific binaries for the CentOS builds in the instructions. That has now been fixed and should be visible here:
[afni.nimh.nih.gov]
(basically just running @update.afni.binaries for the correct package specification, which Rick noted in a separate reply here).

--pt