title: Xamarin Studio Mac, Portable class library, Async and Android
body: <p><strong>Edit:</strong> On the Alpha Channel Profile7, Profile49 and Profile78 seem to work.
  I'm working with the setup that was described here:
  <a href="https://stackoverflow.com/questions/17653208/getting-pcl-mvvmcross-nuget-and-xamarin-studio-to-play-nice-on-mac/17671377#17671377">Getting PCL, Mvvmcross, Nuget and Xamarin Studio to play &quot;nice&quot; on Mac</a> .</p>
  
  <p>How do you make a PCL in Xamarin Studio with Async support work.</p>
  
  <p>I'm usually using Profile104 which is TargetFrameworkVersion v4.0</p>
  
  <p>I tried the following combinations of the hree different v4.5 profiles 
  Profile7, Profile49, Profile78 with the different versions of Xamarin Studio:</p>
  
  <pre><code>                              Profile7     Profile 49    Profile 78
  Alpha (4.1.10, mono=3.2.2)     1            1             1
  Beta (4.0.12, mono=3.2.1)      2            2             2
  Stable (4.0.12, mono=3.2.0)    1            1             1
  </code></pre>
  
  <ol>
  <li>System.Type, System.Threading not found. Unusable</li>
  <li>Profile not found: /Library/Frameworks/Mono.framework/Versions/3.2.1/lib/mono/xbuild/Microsoft/Portable/v4.5/Microsoft.Portable.CSharp.targets is missing</li>
  </ol>
  
  <p>Basically none of the 4.5 profiles is working in any of the currently available Xamarin Studio versions for Mac.</p>