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Package configuration files generated by `configure_package_config_file` set this variable in `@PACKAGE_INIT@` and then use it later. There may be intervening calls to `find_package`, e.g., via `find_dependency`. If the loaded package also used `configure_package_config_file`, it may change the value of `PACKAGE_PREFIX_DIR`. Explicitly save and restore the value to avoid this. Fixes: #25827