lol/build/msbuild/lol-bullet.props

<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">

  <ItemGroup>
    <ProjectReference Condition="'$(enable_bullet)'!='no'" Include="$(LolDir)\src\3rdparty\lol-bullet.vcxproj">
      <Project>{83d3b207-c601-4025-8f41-01dedc354661}</Project>
    </ProjectReference>
  </ItemGroup>

</Project>