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Error while launching program on raspberry pi 3

  • Welcome,

    I just install Qt and OpenGL libraries and wanted to lauch a simple window program, just show window. First I had problem with even compile it. It showed that can't find #include<QApplication> ("No such file or directory"). I searched that I must put "QT += widgets" to .pro file. It compiled but when I wanted to launch my program I got another warning, it said "libEGL warning: DRI2: failed to authenticate" and nothing else, I had to ctrl+c.
    I need it to my thesis, so... if you know how to fix it I would be grateful.

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