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According to the CMake documentation, `HINTS` "should be paths computed by system introspection, such as a hint provided by the location of another item already found", which is precisely the case in the `FindQRencode` module. Entries in `HINTS` are searched before those in `PATHS`. On macOS, Homebrew’s `libqrencode` will therefore be located at its real path rather than via the symlink in the default prefix.