/usr/include/Poco/Util/ is in libpoco-dev 1.3.6p1-5.1build1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/Poco/Util/AbstractConfiguration.h
/usr/include/Poco/Util/Application.h
/usr/include/Poco/Util/ConfigurationMapper.h
/usr/include/Poco/Util/ConfigurationView.h
/usr/include/Poco/Util/FilesystemConfiguration.h
/usr/include/Poco/Util/HelpFormatter.h
/usr/include/Poco/Util/IniFileConfiguration.h
/usr/include/Poco/Util/IntValidator.h
/usr/include/Poco/Util/LayeredConfiguration.h
/usr/include/Poco/Util/LoggingConfigurator.h
/usr/include/Poco/Util/LoggingSubsystem.h
/usr/include/Poco/Util/MapConfiguration.h
/usr/include/Poco/Util/Option.h
/usr/include/Poco/Util/OptionCallback.h
/usr/include/Poco/Util/OptionException.h
/usr/include/Poco/Util/OptionProcessor.h
/usr/include/Poco/Util/OptionSet.h
/usr/include/Poco/Util/PropertyFileConfiguration.h
/usr/include/Poco/Util/RegExpValidator.h
/usr/include/Poco/Util/ServerApplication.h
/usr/include/Poco/Util/Subsystem.h
/usr/include/Poco/Util/SystemConfiguration.h
/usr/include/Poco/Util/Timer.h
/usr/include/Poco/Util/TimerTask.h
/usr/include/Poco/Util/TimerTaskAdapter.h
/usr/include/Poco/Util/Util.h
/usr/include/Poco/Util/Validator.h
/usr/include/Poco/Util/WinRegistryConfiguration.h
/usr/include/Poco/Util/WinRegistryKey.h
/usr/include/Poco/Util/WinService.h
/usr/include/Poco/Util/XMLConfiguration.h