title: make is not recognize as an internal or external command
body: <p>I am using Windows-7. I installed <strong>Ruby 1.9.3p327</strong> and <strong>Rails 3.2.9</strong>.</p>
  
  <p>Now, I create a project then run command in command prompt <code>"rails install json -v 1.7.7"</code> but get error below</p>
  
  <pre><code>make
  'make' is not recognized as an internal or external command,
  operable program or batch file.
  </code></pre>
  
  <p>What is make and how to resolve it.</p>
  
  <p>thanks</p>