/usr/include/qt4/QtHelp/ is in libqt4-dev 4:4.8.5+git192-g085f851+dfsg-2ubuntu4.
This file is owned by root:root, with mode 0o755.
..
/usr/include/qt4/QtHelp/QHelpContentItem
/usr/include/qt4/QtHelp/QHelpContentModel
/usr/include/qt4/QtHelp/QHelpContentWidget
/usr/include/qt4/QtHelp/QHelpEngine
/usr/include/qt4/QtHelp/QHelpEngineCore
/usr/include/qt4/QtHelp/QHelpGlobal
/usr/include/qt4/QtHelp/QHelpIndexModel
/usr/include/qt4/QtHelp/QHelpIndexWidget
/usr/include/qt4/QtHelp/QHelpSearchEngine
/usr/include/qt4/QtHelp/QHelpSearchQuery
/usr/include/qt4/QtHelp/QHelpSearchQueryWidget
/usr/include/qt4/QtHelp/QHelpSearchResultWidget
/usr/include/qt4/QtHelp/QtHelp
/usr/include/qt4/QtHelp/qhelp_global.h
/usr/include/qt4/QtHelp/qhelpcontentwidget.h
/usr/include/qt4/QtHelp/qhelpengine.h
/usr/include/qt4/QtHelp/qhelpenginecore.h
/usr/include/qt4/QtHelp/qhelpindexwidget.h
/usr/include/qt4/QtHelp/qhelpsearchengine.h
/usr/include/qt4/QtHelp/qhelpsearchquerywidget.h
/usr/include/qt4/QtHelp/qhelpsearchresultwidget.h