aspnetcore/src/Components/Components/ref/Directory.Build.props

<Project>

  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory)..\, Directory.Build.props))\Directory.Build.props" />

  <ItemGroup>
    <Compile Include="Microsoft.AspNetCore.Components.netstandard2.0.Manual.cs" />
  </ItemGroup>

</Project>