title: Is there a way to have platform-specific dependencies in environment.yml?
body: <p>I'm trying to use Conda to set up build &amp; testing environments for a project (<a href="https://github.com/lenskit/lenskit" rel="noreferrer">LensKit</a>), and need to have platform-specific dependencies.  Specifically, on Linux builds I need <code>libgfortran</code> and <code>openssl</code>, but not on Windows.</p>
  
  <p>Is there a way that I can state, in <code>environment.yml</code>, that I need <code>libgfortran</code> but only on the 32- and 64-bit Linux platforms? Or do I need to have separate environment definitions to cover this case?</p>
  
  <p>The other potential solution I see is creating a dummy package and publishing it to <a href="http://anaconda.org" rel="noreferrer">http://anaconda.org</a> that just depends on the required base packages for each platform, and require that package in <code>environment.yml</code>.</p>