1 !isEmpty(QMAKE_INCDIR_EGL): INCLUDEPATH += $$QMAKE_INCDIR_EGL

     2 !isEmpty(QMAKE_LIBDIR_EGL): LIBS += -L$$QMAKE_LIBDIR_EGL

     3 !isEmpty(QMAKE_LIBS_EGL): LIBS += $$QMAKE_LIBS_EGL