. Pro file the following


Main. CPP file the following


Tried some methods on the network, has failed to solve

CodePudding user response:

To check the first
- the system installed the QT runtime only, not install QT development libraries?
- system install QT development library version is wrong? (such as: very old QT version QApplication header name called QApplication. H)
- their extra install QT development repository location not standard, lead to IDE can't find you?
See if there are any problems,

CodePudding user response:

Should be you did not install Qt libraries is not installed, uninstall and reinstall, pay attention to check

CodePudding user response:

refer to the second floor Italink response:

should be you did not install Qt libraries is not installed, uninstall and reinstall, pay attention to check the

Excuse me which components should be installed?