linux-packaging-mono/external/corefx/pkg/baseline/baseline.props

<Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <Import Project="..\Microsoft.Private.PackageBaseline\Microsoft.Private.PackageBaseline.props" />

  <PropertyGroup>
    <!-- Set PackageIndexFile to point to our local repo's index.  This tells the packaging targets
         which index should be used for updates -->
    <PackageIndexFile>$(MSBuildThisFileDirectory)..\Microsoft.Private.PackageBaseline\packageIndex.json</PackageIndexFile>
  </PropertyGroup>

  <!--
    Below targets should moved to packaging.targets in BuildTools but keeping in corefx for convenience right now
  -->

  <Target Name="BlockStable" Condition="'$(BlockStable)' == 'true'" AfterTargets="CalculatePackageVersion">
    <!-- DO NOT ship this packages as stable -->
    <Error Condition="!$(PackageVersion.Contains('-'))" Text="Package $(Id) should not be built stable" />
  </Target>

  <!-- Get the package version if it isn't marked as block stable -->
  <Target Name="GetPackageIdentityIfStable"
          Returns="@(_StablePackageIdentity)">

    <ItemGroup Condition="'$(BlockStable)' != 'true'">
      <_StablePackageIdentity Include="$(Id)">
        <Version>$(PackageVersion)</Version>
      </_StablePackageIdentity>
    </ItemGroup>
  </Target>
</Project>