You should have the "local" version installed for Mac, as described here:
[
afni.nimh.nih.gov]
As part of following all those instructions, please make sure you have the DYLD_LIBRARY_PATH set (it's explained there).
You can check the status of your installation with Rick's handy "afni_system_check.py -check_all" tool (also described in those pages).
--pt