Do you have QtCreator on your system ?
If so, create a simple 'hello world' application and try to run and compile that. If this is OK, then your Qt installation is (probably) OK.
Then, open the qextserialport.pro file using Qt Creator and do a 'build all'
By the way, you didn't put the qextserialport source under the src directory of Qt itself did you ? You should put things like this in your own personal folder where you keep your Qt projects.
Regards,
Marc
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