undefined reference to `WinMain'|

This error typically occurs when you are trying to build a Windows application using the wrong entry point.

The entry point for a Windows application is typically WinMain(), which is the main function for a GUI-based application. However, if you are building a console application, the entry point should be main() or wmain().

To fix this error, make sure that you are using the correct entry point for your application. If you are building a Windows application, make sure that your code includes a WinMain() function. If you are building a console application, make sure that your code includes a main() or wmain() function.

Additionally, make sure that you have included the correct libraries in your project. If you are using any external libraries, make sure that you have included them in your project and linked them correctly.