Added in version 3.29.
This is a CMake Environment Variable. Its initial value is taken from the calling process environment.
The CMAKE_INSTALL_PREFIX environment variable specifies a custom default value for the CMAKE_INSTALL_PREFIX variable in place of the default values specified by CMake itself. The value specified must be an absolute path to a directory.
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https://cmake.org/cmake/help/v3.31/envvar/CMAKE_INSTALL_PREFIX.html