qt5base-lts/mkspecs/features/c++11.prf

QMAKE_CXXFLAGS += $$QMAKE_CXXFLAGS_CXX11
QMAKE_OBJECTIVE_CFLAGS += $$QMAKE_CXXFLAGS_CXX11
QMAKE_LFLAGS += $$QMAKE_LFLAGS_CXX11

contains(QMAKE_LFLAGS, -stdlib=libc++) {
    equals(QMAKE_MACOSX_DEPLOYMENT_TARGET, 10.6): \
        QMAKE_MACOSX_DEPLOYMENT_TARGET = 10.7
    contains(QMAKE_IOS_DEPLOYMENT_TARGET, ^4.*): \
        QMAKE_IOS_DEPLOYMENT_TARGET = 5.0
}