Avalonia/build/Base.props

<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <!-- '!NET6_0_OR_GREATER' equivalent -->
  <ItemGroup Condition="!('$(TargetFrameworkIdentifier)' == '.NETCoreApp' AND $([MSBuild]::VersionGreaterThanOrEquals($(TargetFrameworkVersion), '6.0')))">
    <PackageReference Include="System.ValueTuple" Version="4.5.0" />
    <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="6.0.0" />
    <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.4" />
    <PackageReference Include="System.Runtime.CompilerServices.Unsafe" Version="4.6.0" />
  </ItemGroup>
</Project>