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Qt5.1 failed to load platform plugin xcb

  • i'm using ubuntu 12.04 and qt5.1. i compile my project with no errors but when i try to launch my application on other machine i get the following error:

    @Failed to load platform plugin "xcb". Available platforms are:

    Annullato (core dump creato)@

    i add the required libraries to the ld_library_path: => (0xb7705000) => /home/computer/libs/ (0xb70c4000) => /home/computer/libs/ (0xb6c42000) => /usr/lib/i386-linux-gnu/ (0xb6b5c000) => /lib/i386-linux-gnu/ (0xb6b3e000) => /lib/i386-linux-gnu/ (0xb6995000) => /home/computer/libs/ (0xb652a000) => /home/computer/libs/ (0xb650f000) => /home/computer/libs/ (0xb64bf000) => /home/computer/libs/ (0xb63c6000) => /home/computer/libs/ (0xb6292000) => /home/computer/libs/ (0xb6266000) => /home/computer/libs/ (0xb6044000) => /home/computer/libs/ (0xb5eca000) => /home/computer/libs/ (0xb5ec5000) => /home/computer/libs/ (0xb5ec2000) => /home/computer/libs/ (0xb5eb9000)
    /lib/ (0xb7706000) => /home/computer/libs/ (0xb5e5a000) => /home/computer/libs/ (0xb5e52000) => /home/computer/libs/ (0xb5e16000) => /home/computer/libs/ (0xb5df5000) => /home/computer/libs/ (0xb48ac000) => /home/computer/libs/ (0xb4895000) => /home/computer/libs/ (0xb4882000) => /home/computer/libs/ (0xb487e000) => /home/computer/libs/ (0xb4878000) => /home/computer/libs/ (0xb4875000) => /home/computer/libs/ (0xb485d000) => /home/computer/libs/ (0xb4856000) => /home/computer/libs/ (0xb4849000) => /home/computer/libs/ (0xb4845000) => /home/computer/libs/ (0xb483e000)@

    but it doesn't work. what is the problem?

    i also try to reconfigure qt with the option -qt-xcb but it still doesn't work.

    ps. sorry for my bad english

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