/usr/include/ is in liblog4cpp5-dev 1.0-4.
This file is owned by root:root, with mode 0o755.
..
/usr/include/log4cpp/
/usr/include/log4cpp/threading/
/usr/include/log4cpp/threading/BoostThreads.hh
/usr/include/log4cpp/threading/DummyThreads.hh
/usr/include/log4cpp/threading/OmniThreads.hh
/usr/include/log4cpp/threading/PThreads.hh
/usr/include/log4cpp/threading/MSThreads.hh
/usr/include/log4cpp/threading/Threading.hh
/usr/include/log4cpp/Appender.hh
/usr/include/log4cpp/AppenderSkeleton.hh
/usr/include/log4cpp/AppendersFactory.hh
/usr/include/log4cpp/BufferingAppender.hh
/usr/include/log4cpp/FactoryParams.hh
/usr/include/log4cpp/LayoutsFactory.hh
/usr/include/log4cpp/LevelEvaluator.hh
/usr/include/log4cpp/PassThroughLayout.hh
/usr/include/log4cpp/TriggeringEventEvaluator.hh
/usr/include/log4cpp/TriggeringEventEvaluatorFactory.hh
/usr/include/log4cpp/FixedContextCategory.hh
/usr/include/log4cpp/LayoutAppender.hh
/usr/include/log4cpp/FileAppender.hh
/usr/include/log4cpp/RollingFileAppender.hh
/usr/include/log4cpp/IdsaAppender.hh
/usr/include/log4cpp/OstreamAppender.hh
/usr/include/log4cpp/StringQueueAppender.hh
/usr/include/log4cpp/SyslogAppender.hh
/usr/include/log4cpp/RemoteSyslogAppender.hh
/usr/include/log4cpp/Layout.hh
/usr/include/log4cpp/SimpleLayout.hh
/usr/include/log4cpp/BasicLayout.hh
/usr/include/log4cpp/PatternLayout.hh
/usr/include/log4cpp/Category.hh
/usr/include/log4cpp/CategoryStream.hh
/usr/include/log4cpp/HierarchyMaintainer.hh
/usr/include/log4cpp/Configurator.hh
/usr/include/log4cpp/BasicConfigurator.hh
/usr/include/log4cpp/SimpleConfigurator.hh
/usr/include/log4cpp/PropertyConfigurator.hh
/usr/include/log4cpp/LoggingEvent.hh
/usr/include/log4cpp/Priority.hh
/usr/include/log4cpp/NDC.hh
/usr/include/log4cpp/TimeStamp.hh
/usr/include/log4cpp/Filter.hh
/usr/include/log4cpp/Export.hh
/usr/include/log4cpp/Portability.hh
/usr/include/log4cpp/Win32DebugAppender.hh
/usr/include/log4cpp/NTEventLogAppender.hh
/usr/include/log4cpp/AbortAppender.hh
/usr/include/log4cpp/Manipulator.hh
/usr/include/log4cpp/config.h
/usr/include/log4cpp/config-win32.h
/usr/include/log4cpp/config-openvms.h
/usr/include/log4cpp/convenience.h