--- PATCH: make_average_subject ----

https://surfer.nmr.mgh.harvard.edu/pub/dist/freesurfer/6.0.0-patch/README

Download make_average_subject and the platform-specific version of mri_aparc2aseg
from this directory and move them to your freesurfer bin directory via:

mv make_average_subject $FREESURFER_HOME/bin
mv mri_aparc2aseg.platform $FREESURFER_HOME/bin/mri_aparc2aseg
chmod +x $FREESURFER_HOME/bin/mri_aparc2aseg $FREESURFER_HOME/bin/make_average_subject

We currently do not have a mac build of mri_aparc2aseg, and we recommend
downloading the freesurfer dev release to resolve this issue.