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79c93,95 < !win32: QMAKE_CXXFLAGS += $$QMAKE_CFLAGS_ISYSTEM $$PWD/../Third/ --- > !isEmpty(QMAKE_CFLAGS_ISYSTEM) { > QMAKE_CXXFLAGS += $$QMAKE_CFLAGS_ISYSTEM $$PWD/../Third/ > }