CMAKE_PREFIX_PATH
;-list of directories specifying installation prefixes to be searched by the find_package(), find_program(), find_library(), find_file(), and find_path() commands. Each command will add appropriate subdirectories (like bin, lib, or include) as specified in its own documentation.
По умолчанию это пустое значение. Оно должно быть установлено проектом.
См. также CMAKE_SYSTEM_PREFIX_PATH, CMAKE_INCLUDE_PATH, CMAKE_LIBRARY_PATH, CMAKE_PROGRAM_PATH, and CMAKE_IGNORE_PATH.
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https://cmake.org/cmake/help/v3.13/variable/CMAKE_PREFIX_PATH.html