title: Call make in all subdirectories
body: <p>I have a directory structure such as:</p>
  
  <pre><code>home
  |-- folder1
      |-- Makefile
      |-- code1.cpp
  |-- folder2
      |-- Makefile
      |-- code2.cpp
  |-- many more folders with Makefile and code inside
   .
   .
  </code></pre>
  
  <p>I want to call make on all the folders. How should I do about doing this? Thanks!</p>