title: mbed CLI: make.py: error: Could not find executable for ARM
body: <p>I'm trying to compile a program with the mbed CLI using the following command:</p>
  
  <pre><code>mbed compile -m UBLOX_C027 -t ARM
  </code></pre>
  
  <p>It results in the following error: </p>
  
  <pre><code>make.py: error: Could not find executable for ARM.
  Currently set search path: No path set
  </code></pre>
  
  <p>How can I set the executable?</p>