Rebuild Enlighten from source

After you modify Engine source code you can build the editor or game using UnrealBuildTool as usual.
When upgrading to an unsupported platform SDK, you may also need to rebuild the Enlighten libraries against the new SDK. In rare cases you might need to make changes to the Enlighten libraries.
You can find the Enlighten library source code within the UE4 third party source folder:

Engine/Source/ThirdParty/Enlighten

Modify and rebuild Enlighten libraries

You control the configurations to be built by editing EnlightenBuildConfig.xml. To build libraries compatible with UE4, make sure the configuration matches the Visual Studio or console SDK versions that you build UE4 against.
To build and install the Enlighten libraries and tools required by UE4.

To build Enlighten libraries from source

1. In a command prompt window, execute:

   cd Engine\Source\ThirdParty\Enlighten
   BuildAndInstallEnlighten.bat 

   This scripts returns an exit code of zero if the build succeeded. Otherwise, an error is printed in the console output. 

   To build Enlighten, you must install the June 2010 DirectX SDK

2. Build the UE4 editor or game using UnrealBuildTool.