title: GNAT GPS IDE not binding and linking with strange error
body: <p>I am trying to use GPS IDE as my alternative development tool on OS X El Capitan (moving away from OS X 10.5 Xcode 3.0). But I have stumbled on one strange error:</p>
  
  <pre><code>gnat bind myprog.bexch
  gnatbind: Cannot find: myprog.bexch.ali
  gprbuild: unable to bind myprog.adb [2016-01-20 18:49:07] process
  exited with status 4, 100% (13/13), elapsed time: 04.77s
  </code></pre>
  
  <p>In my directory, I can only find myprog.bexch. Looks like gnatbind does not produce myprog.bexch.ali</p>
  
  <p>My GPR looks like this:</p>
  
  <pre><code>project Amygdala_Cortex is
  
      for Object_Dir use "Build/";
      for Exec_Dir use "Build/Debug/";
      for Library_Name use "";
      for Library_Ali_Dir use "";
      for Library_Kind use "static";
  
  
      package Compiler is
          for Default_Switches ("ada") use ("-g", "-O2", "-I/opt/local/include/aws", "-I/opt/local/include/aws/components");
      end Compiler;
  
      package Binder is
          for Driver ("ada") use "/usr/local/gnat/bin/gnatbind";
      end Binder;
  
      package Linker is
          for Linker_Options use ();
      end Linker;
  
      for Main use ("amygdala_cortex.adb");
  
  end Amygdala_Cortex;
  </code></pre>
  
  <p>Apparently, I don't have gprbind in my directories.</p>
  
  <p>Have I done something wrong or missed something in the GPR?</p>
  
  <p>I am using gnat-gpl-2015-x86_64-darwin (GNAT GPL 2015 (20150428-49)) on El Capitan (10.11.2).</p>
  
  <p>Thanks.</p>