LESS, compile issues
<p>I'm using <code>Visual Studio 2012</code> and <code>Web Essential 2012</code> and <code>Less</code> generates the <code>css</code> not as, as expected</p>

<pre><code>//style.less

 .selector{
     max-height: calc(100vh - 200px)
 }
</code></pre>

<p>In the style.css it's generates something like this</p>

<pre><code>//style.css
.selector{
      max-height: calc(-100vh);
}
</code></pre>

<p><strong>Any ideas?</strong></p>