VPATH在qmake中的解释是如下:
This variable tells qmake where to search for files it cannot open. With this you may tell qmake where it may look for things like SOURCES, and if it finds an entry in SOURCES that cannot be opened it will look through the entire VPATH list to see if it can find the file on its own.
我觉得意思大致是这样。举个例子,如果你要打开的文件类型是VC所不支持解析的格式,那么就告诉它文件存放的路径,它可以找到。