/usr/include/kdevplatform/debugger/ is in kdevelop-dev 4:5.2.1-1ubuntu4.
This file is owned by root:root, with mode 0o755.
..
/usr/include/kdevplatform/debugger/breakpoint/
/usr/include/kdevplatform/debugger/breakpoint/breakpoint.h
/usr/include/kdevplatform/debugger/breakpoint/breakpointdetails.h
/usr/include/kdevplatform/debugger/breakpoint/breakpointmodel.h
/usr/include/kdevplatform/debugger/breakpoint/breakpointwidget.h
/usr/include/kdevplatform/debugger/debuggerexport.h
/usr/include/kdevplatform/debugger/framestack/
/usr/include/kdevplatform/debugger/framestack/framestackmodel.h
/usr/include/kdevplatform/debugger/interfaces/
/usr/include/kdevplatform/debugger/interfaces/ibreakpointcontroller.h
/usr/include/kdevplatform/debugger/interfaces/idebugsession.h
/usr/include/kdevplatform/debugger/interfaces/iframestackmodel.h
/usr/include/kdevplatform/debugger/interfaces/ivariablecontroller.h
/usr/include/kdevplatform/debugger/util/
/usr/include/kdevplatform/debugger/util/pathmappings.h
/usr/include/kdevplatform/debugger/util/treeitem.h
/usr/include/kdevplatform/debugger/util/treemodel.h
/usr/include/kdevplatform/debugger/util/treeview.h
/usr/include/kdevplatform/debugger/variable/
/usr/include/kdevplatform/debugger/variable/variablecollection.h