Environment.Build.props

<Project>
  <PropertyGroup>
    <EnvironmentBuildPropsImported>true</EnvironmentBuildPropsImported>
  </PropertyGroup>
  
  <PropertyGroup Condition="'$(CI)' == ''">
    <CI>false</CI>
    <CI Condition="'$(TF_BUILD)' == 'true'">true</CI>
  </PropertyGroup>
  
  <PropertyGroup>
    <Use2017 Condition="'$(Use2017)' == '' AND '$(MSBuildRuntimeType)' == 'Mono'">$(FrameworkSDKRoot.Contains('/Versions/5'))</Use2017>
    <Use2017 Condition="'$(Use2017)' == '' AND '$(MSBuildAssemblyVersion)' &lt; '16.0'">true</Use2017>
    <Use2017 Condition="'$(Use2017)' == ''">false</Use2017>
  </PropertyGroup>

  <!-- This is used by the libraries -->
  <PropertyGroup Condition="'$(AndroidTargetFrameworks)' == ''">
    <AndroidTargetFrameworks Condition="'$(Use2017)' == 'true'">MonoAndroid90;</AndroidTargetFrameworks>
    <AndroidTargetFrameworks Condition="'$(Use2017)' == 'false'">MonoAndroid90;MonoAndroid10.0;</AndroidTargetFrameworks>
  </PropertyGroup>
</Project>