Avalonia/build/System.Memory.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.Memory" Version="4.5.3" />
  </ItemGroup>
</Project>