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# ANGLE EGL Headers The EGL headers ANGLE uses are generated using the Khronos tools but modified to include function pointer types and function prototype guards. ### Regenerating EGL.h 1. Install **Python 3** (not 2) with the **lxml** addon. You can do this using `pip install lxml` from your Python's Scripts folder. 1. Clone [https://github.com/KhronosGroup/EGL-Registry.git](https://github.com/KhronosGroup/EGL-Registry.git). 1. Edit `EGL-Registry/api/genheaders.py`: 1. Look for the section titled `# EGL API - EGL/egl.h (no function pointers, yet @@@)` 1. Change `genFuncPointers = False,` to `genFuncPointers = True,` 1. Change `protectProto = False,` to `protectProto = 'nonzero',` 1. Change `protectProtoStr = 'EGL_EGLEXT_PROTOTYPES',` to `protectProtoStr = 'EGL_EGL_PROTOTYPES',` 1. Set your working directory to `EGL-Registry/api/`. 1. Run `python genheaders.py -registry egl.xml EGL/egl.h` 1. The generated header will now be in `EGL-Registry/api/EGL/egl.h`. You can copy the header over to this folder. 1. Also update `scripts/egl.xml` with the latest version from `EGL-Registry/api/`.