<_BootstrapperFile Condition=" $([MSBuild]::IsOSUnixLike()) ">build.sh <_BootstrapperFile Condition="! $([MSBuild]::IsOSUnixLike()) ">build.cmd <_BootstrapperError> Package references have not been pinned. Run './$(_BootstrapperFile) /t:Pin'. Also, you can run './$(_BootstrapperFile) /t:Restore' which will pin *and* restore packages. '$(_BootstrapperFile)' can be found in '$(MSBuildThisFileDirectory)'.