afni.nimh.nih.gov

If this is on a relative recent Mac OS specifically, the problem may be the one solved by this step from the Mac install instructions:

XQuartz has altered the library format, so adjust DYLD_LIBRARY_PATH by doing either:

tcsh syntax:

touch ~/.cshrc
echo 'setenv DYLD_LIBRARY_PATH /opt/X11/lib/flat_namespace' >> ~/.cshrc

bash syntax:

touch ~/.bashrc
echo 'export DYLD_LIBRARY_PATH=/opt/X11/lib/flat_namespace' >> ~/.bashrc