Eine Umgehungslösung ist Verweise auf die csproj Datei manuell hinzuzufügen:
<Reference Include="gtk-sharp, Version=2.4.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f">
<SpecificVersion>False</SpecificVersion>
</Reference>
<Reference Include="gdk-sharp, Version=2.4.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f">
<SpecificVersion>False</SpecificVersion>
</Reference>
<Reference Include="glib-sharp, Version=2.4.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f">
<SpecificVersion>False</SpecificVersion>
</Reference>
<Reference Include="glade-sharp, Version=2.4.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f">
<SpecificVersion>False</SpecificVersion>
</Reference>
<Reference Include="pango-sharp, Version=2.4.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f">
<SpecificVersion>False</SpecificVersion>
</Reference>
<Reference Include="atk-sharp, Version=2.4.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f">
<SpecificVersion>False</SpecificVersion>
</Reference>
<Reference Include="Mono.Posix" />