title: Makefile : contains string
body: <p>A variable returns <code>MINGW32_NT-5.1</code> or <code>CYGWIN_NT-5.1.</code> (yea, dot at the end)</p>
  
  <p>Need to compare that given var contains <code>NT-5.1</code> positioned anywhere.</p>
  
  <p>Using cygwin and would like to be compatible with pretty much any *nix.</p>