Problem with qtext serial port!

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QT

QT-Creator

Hi everyone,

I have not much experience in qt, I was developing a serial port terminal then i came acroos with this

example code. it works perfect in windows, but i have to use it in
linux. when i tried to build this code in linux i get this error (without quotes) "error: cannot find -lXext"

What can i do to solve this issue?

Thanks in advance.