Directory.Build.props

<Project>
  <ItemGroup>
    <!-- Required for building the .NET Framework target (net45) on Linux and macOS without mono.
         Eventually, explicitly using the reference assemblies shouldn't be needed anymore, see https://github.com/dotnet/designs/pull/33#issuecomment-528457298 -->
    <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.0" PrivateAssets="All" />
  </ItemGroup>
</Project>