dotnet-installer/TestAssets/DesktopTestProjects/LibWithProjTool2Fx/Lib.csproj

<Project Sdk="Microsoft.NET.Sdk" ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <PropertyGroup>
    <TargetFrameworks>netstandard1.6;net451</TargetFrameworks>
    <OutputType>Library</OutputType>
    <AssetTargetFallback Condition=" '$(TargetFramework)' == 'netstandard1.6' ">$(AssetTargetFallback);portable-net45+win8;dnxcore50;netcoreapp2.1</AssetTargetFallback>
    <RestoreAdditionalProjectSources Condition="'$(TEST_PACKAGES)' != ''">$(TEST_PACKAGES)</RestoreAdditionalProjectSources>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="dotnet-desktop-and-portable" Version="1.0.0-*" />
  </ItemGroup>
  <ItemGroup Condition=" '$(TargetFramework)' == 'net451' ">
    <Reference Include="System" />
    <Reference Include="Microsoft.CSharp" />
  </ItemGroup>

  <ItemGroup>
    <DotNetCliToolReference Include="dotnet-dependency-tool-invoker" Version="1.0.0-*" />
  </ItemGroup>
</Project>