Directory.Build.targets

<Project InitialTargets="CheckForBuildTools">
  
  <Target Name="CheckForBuildTools">
    <Error Condition="!Exists('$(ToolsDir)')"
           Text="The tools directory [$(ToolsDir)] does not exist. Please run build in the root of the repo to ensure the tools are installed before attempting to build an individual project." />
  </Target>

  <Import Project="$(ToolsDir)/versioning.targets" Condition="Exists('$(ToolsDir)/versioning.targets')" />
</Project>