When I try to \"brew link autoconf\" in the terminal I keep getting this error.
Error: Could not symlink file: /usr/local/Cellar/autoconf/2.69/share/emacs/site-lisp /usr
You need to make sure that all the files and folders in /usr/local are writable by you. You can do this by typing the following command
chown -R yourusername /usr/local chmod -R u+w /usr/local
You may have to use sudo for those commands to work.
After you do this, try linking again.