Qt:warning: The build directory is not at the same level as the source directory

-1: warning: The build directory is not at the same level as the source directory, which could be the reason for the build failure. 在Qt重新打開一個項目時，各種報錯，最後一個提示如上。 參考了https://blog.csdn.net/neuq_jtxw007/ar

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