title: How to install `build-essential` in `Cygwin`?
body: <p>How to install <code>build-essential</code> in <code>Cygwin</code>?
  <br />
  I've tried using: <code>apt-cyg install build-essential</code>
  But does not work. </p>
  
  <pre><code>Installing build-essential
  Package build-essential not found or ambiguous name, exiting
  </code></pre>
  
  <p>I'm also having problems like:</p>
  
  <pre><code>(gedit: 13864): Gtk-WARNING **: can not open display:
  </code></pre>
  
  <p><br />
  So I can not install crunch.
  See It:
  <br /></p>
  
  <pre><code>$ make all
  Building binary...
  /usr/bin/gcc -pthread -Wall -pedantic -std=c99 undefined crunch.c -lm -o crunch
  gcc: error: undefined: No such file or directory
  Makefile:48: recipe for target 'crunch' failed
  make: *** [crunch] Error 1
  </code></pre>
  
  <p>What's the problem here, and how can I fix it?</p>