title: Maxima does not start on Sierra
body: <p>I downloaded and installed the latest Ma version of Maxima from source forge. When I try to launch it, I get 
  “Maxima.app” is damaged and can’t be opened. You should move it to the Trash.
  This happens with both available versions, the one with VTK and the one without VTK.
  How can I get it running?
  I have MacOS 10.12.6
  and both versions are here:
  <a href="https://sourceforge.net/projects/maxima/files/Maxima-MacOS/5.40.0-MacOSX/" rel="nofollow noreferrer">https://sourceforge.net/projects/maxima/files/Maxima-MacOS/5.40.0-MacOSX/</a></p>