title: There is no Cellar file in my usr/local dir for brew
body: <p>I have been trying to use brew to install tmux but every time I put in <code>brew install tmux</code> it would tell me:</p>
  
  <blockquote>
    <p>Error: Could not create /usr/local/Cellar Check you have permission to write to /usr/local</p>
  </blockquote>
  
  <p>I then tried to do it with sudo but it did not work, which I guest would would not seeing that brew does not want to be used with root. I have already made sure that all the files that are in /usr/local belong to me. I can’t change the /usr/local file; it says: “Operation not permitted”. How can I fix this so Cellar can be created and allow me to install stuff using brew?</p>