/usr/include/log4cxx/pattern/ is in liblog4cxx-dev 0.10.0-13ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/log4cxx/pattern/classnamepatternconverter.h
/usr/include/log4cxx/pattern/datepatternconverter.h
/usr/include/log4cxx/pattern/filedatepatternconverter.h
/usr/include/log4cxx/pattern/filelocationpatternconverter.h
/usr/include/log4cxx/pattern/formattinginfo.h
/usr/include/log4cxx/pattern/fulllocationpatternconverter.h
/usr/include/log4cxx/pattern/integerpatternconverter.h
/usr/include/log4cxx/pattern/levelpatternconverter.h
/usr/include/log4cxx/pattern/linelocationpatternconverter.h
/usr/include/log4cxx/pattern/lineseparatorpatternconverter.h
/usr/include/log4cxx/pattern/literalpatternconverter.h
/usr/include/log4cxx/pattern/loggerpatternconverter.h
/usr/include/log4cxx/pattern/loggingeventpatternconverter.h
/usr/include/log4cxx/pattern/messagepatternconverter.h
/usr/include/log4cxx/pattern/methodlocationpatternconverter.h
/usr/include/log4cxx/pattern/nameabbreviator.h
/usr/include/log4cxx/pattern/namepatternconverter.h
/usr/include/log4cxx/pattern/ndcpatternconverter.h
/usr/include/log4cxx/pattern/patternconverter.h
/usr/include/log4cxx/pattern/patternparser.h
/usr/include/log4cxx/pattern/propertiespatternconverter.h
/usr/include/log4cxx/pattern/relativetimepatternconverter.h
/usr/include/log4cxx/pattern/threadpatternconverter.h
/usr/include/log4cxx/pattern/throwableinformationpatternconverter.h