I installed Qt creator and then Qt library-mingw on Window system.
I tried to compile an example code in the Qt Creator but I got the error message.
Mabe ‘stddef.h’ is one of c++ headers.
I think that the Qt Creator is not connected to mingw.
What should be set or changed in Qt Creator option?
I tried to add INCLUDEPATH to Build environment variables in QtCreator but still not working.
[Eddy : fixed typos in title]
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