QMAKE_CFLAGS += -mmacosx-version-min=10.6
QMAKE_LFLAGS += -mmacosx-version-min=10.6
QMAKE_CXXFLAGS += -mmacosx-version-min=10.6
QMAKE_OBJECTIVE_CFLAGS += -mmacosx-version-min=10.6