/usr/include/src/declarative/debugger/ is in libqt4-private-dev 4:4.8.1-0ubuntu4.
This file is owned by root:root, with mode 0o755.
..
/usr/include/src/declarative/debugger/qdeclarativedebugclient_p.h
/usr/include/src/declarative/debugger/qdeclarativedebuggerstatus_p.h
/usr/include/src/declarative/debugger/qdeclarativedebughelper_p.h
/usr/include/src/declarative/debugger/qdeclarativedebugserver_p.h
/usr/include/src/declarative/debugger/qdeclarativedebugserverconnection_p.h
/usr/include/src/declarative/debugger/qdeclarativedebugservice_p.h
/usr/include/src/declarative/debugger/qdeclarativedebugservice_p_p.h
/usr/include/src/declarative/debugger/qdeclarativedebugtrace_p.h
/usr/include/src/declarative/debugger/qdeclarativeenginedebug_p.h
/usr/include/src/declarative/debugger/qdeclarativeenginedebugservice_p.h
/usr/include/src/declarative/debugger/qdeclarativeinspectorinterface_p.h
/usr/include/src/declarative/debugger/qdeclarativeinspectorservice_p.h
/usr/include/src/declarative/debugger/qjsdebuggeragent_p.h
/usr/include/src/declarative/debugger/qjsdebugservice_p.h
/usr/include/src/declarative/debugger/qpacketprotocol_p.h