Compile QT source code error causes and Solutions

Qt source code compilation error:
1. Source code path contains Chinese font
2. No such file or directory can be found at compile time.
1. Change to English path
2. When compiling the source code, add QT += widgets at the bottom of the project file. Pro.

Baidu Answer Question 2:
Write in the pro qt + = widgets QtWidget this module, introduced said, qmake will help you to generate a makefile, set up the include path and lib path, when the link set libs.

QApplication> Only the declaration is introduced, but there is no lib, so the link will fail.

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