Build.props

<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <ItemGroup>
    <ProjectToBuild Condition="'$(DirectoryToBuild)' == ''" Include="$(MSBuildThisFileDirectory)..\build.proj" />
    <ProjectToBuild Condition="'$(DirectoryToBuild)' != ''" Include="$(MSBuildThisFileDirectory)..\src\dirs.proj" />
  </ItemGroup>
</Project>