title: Lesscss > bootstrap's darken() and lighten() don't compile
body: <p>My Less files aren't compiling as they should. I'm using the Bootstrap less files, most recent ones.</p>
  
  <p>It looks like the less-files are failing because of the  darken() and lighten() classes. </p>
  
  <p>The error is: </p>
  
  <blockquote>
    <p>lessc fatal error: expected color value: failed at <code>background-color:
    darken(@inputBackground, 1%);</code>
    /Applications/MAMP/htdocs/foobar/application/less/forms.less on line
    195</p>
  </blockquote>
  
  <p>When I go to that line, I find the darken() of lighten(), remove that and the error is gone. But a new error appears, also a line with the darken() of lighten() class. Strange, right, or isn't it? Is there a fix someone knows about? Because I don't wanna remove the lighten() and darken() everywhere, they're the nicest functions in Bootstrap less! </p>
  
  <p>Saved the files to UTF8 without BOM already in SublimeText2</p>
  
  <p>Edit: strange, it works when it's on my NAS. Not local on my MacBook.. Is it a OSX issue?</p>