title: ghdl install (tgingold) : gnatmake not found but exists : usr/local/gnat/bin/gnatmake
body: <p>MacOs user : Sierra</p>
  
  <p>Vhdl user too.</p>
  
  <ul>
  <li><p>I installed ada-gpl_2017 : ok (path written in .bash_profile)</p></li>
  <li><p>I installed ghdl via tgingold's git and return a strange error : </p></li>
  </ul>
  
  <p>I did: </p>
  
  <pre><code>./configure --prefix=/usr/local                       # ok
  make                                                  # ok
  sudo make install                                     # not ok
  </code></pre>
  
  <p>The last step returns the following error:</p>
  
  <pre><code>make: gnatmake: No such file or directory
  </code></pre>
  
  <p>But it exists in <code>/usr/local/gnat/bin/gnatmake</code>. Could you help me to solve this error?</p>