Disallowed since version 3.0. See CMake Policy CMP0030.
Copy mesa headers for use in combination with system GL.
use_mangled_mesa(PATH_TO_MESA OUTPUT_DIRECTORY)
The path to mesa includes, should contain gl_mangle.h. The mesa headers are copied to the specified output directory. This allows mangled mesa headers to override other GL headers by being added to the include directory path earlier.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.19/command/use_mangled_mesa.html