使用qmake变量

Question

有没有办法让qmake替换像这样的自定义变量？换句话说，我希望用变量LIBS替换$（LIBS），这样我就可以轻松地改变从一台机器到另一台机器的包含路径。非常感谢提前！

LIBS = c:/tmp/libs.pfo
INCLUDEPATH += . \
$(LIBS)/OpenCV2.1-msvc/include \
$(LIBS)/OpenCV2.1-msvc/modules/core/include \
$(LIBS)/OpenCV2.1-msvc/modules/imgproc/include \
...

我也试过这个无济于事：

LIBS = c:/tmp/libs.pfo
INCLUDEPATH += . \
$$quote($$LIBS/OpenCV2.1-msvc/include) \
$$quote($$LIBS/OpenCV2.1-msvc/modules/core/include) \
$$quote($$LIBS/OpenCV2.1-msvc/modules/imgproc/include) \
...

Answer 1

更新：看到另一个帖子后，我尝试了第三个技巧，哪个有效！ qmake can't evaluate a proper variable

LIBS = c:/tmp/libs.pfo
INCLUDEPATH += . \
$$quote($${LIBS}/OpenCV2.1-msvc/include) \
$$quote($${LIBS}/OpenCV2.1-msvc/modules/core/include) \
$$quote($${LIBS}/OpenCV2.1-msvc/modules/imgproc/include) \
...