/usr/include/qt5/QtConcurrent/ is in qtbase5-dev 5.2.1+dfsg-1ubuntu14.3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/qt5/QtConcurrent/QtConcurrent
/usr/include/qt5/QtConcurrent/QtConcurrentDepends
/usr/include/qt5/QtConcurrent/QtConcurrentFilter
/usr/include/qt5/QtConcurrent/QtConcurrentMap
/usr/include/qt5/QtConcurrent/QtConcurrentRun
/usr/include/qt5/QtConcurrent/QtConcurrentVersion
/usr/include/qt5/QtConcurrent/qtconcurrent_global.h
/usr/include/qt5/QtConcurrent/qtconcurrentcompilertest.h
/usr/include/qt5/QtConcurrent/qtconcurrentexception.h
/usr/include/qt5/QtConcurrent/qtconcurrentfilter.h
/usr/include/qt5/QtConcurrent/qtconcurrentfilterkernel.h
/usr/include/qt5/QtConcurrent/qtconcurrentfunctionwrappers.h
/usr/include/qt5/QtConcurrent/qtconcurrentiteratekernel.h
/usr/include/qt5/QtConcurrent/qtconcurrentmap.h
/usr/include/qt5/QtConcurrent/qtconcurrentmapkernel.h
/usr/include/qt5/QtConcurrent/qtconcurrentmedian.h
/usr/include/qt5/QtConcurrent/qtconcurrentreducekernel.h
/usr/include/qt5/QtConcurrent/qtconcurrentrun.h
/usr/include/qt5/QtConcurrent/qtconcurrentrunbase.h
/usr/include/qt5/QtConcurrent/qtconcurrentstoredfunctioncall.h
/usr/include/qt5/QtConcurrent/qtconcurrentthreadengine.h
/usr/include/qt5/QtConcurrent/qtconcurrentversion.h