Supposedly it is, but I have not managed to get it to work. I have followed instructions via: man synthetic.conf added the following to /etc/synthetic.conf (permissions: 644) XYZ /Applications/MAMP/htdocs/system XYZ2 /System/Volumes/Data/home XYZ3 System/Volumes/Data/home ...trying different syntax and paths: EXAMPLES # create an empty directory named "foo" at / which may be mounted over foo # create a symbolic link named "bar" at / which points to # "System/Volumes/Data/bar", a writeable location at the root of the data volume bar System/Volumes/Data/bar # create a symbolic link named "baz" at / which points to "Users/me/baz" baz Users/me/baz but after reboot I see no reference to these symbolic links: ls -l ps. confirming permisions: root: read, write wheel: read everyone: read I really need this to work. Any have any thoughts?