title: Error when trying to "brew link autoconf"
body: <p>When I try to "brew link autoconf" in the terminal I keep getting this error.</p>
  
  <p>Error: Could not symlink file: /usr/local/Cellar/autoconf/2.69/share/emacs/site-lisp
  /usr/local/share/emacs is not writable. You should change its permissions.</p>
  
  <p>Anyone have any ideas on how to fix this? Thanks!</p>