What does CONFIG += x11 actually do?



  • Simple Question, what does >CONFIG += x11< if defined for qmake?
    It is part of the general configuration. However the docs are not very verbose about that:

    "The project is an X11 application or library."
    

    If compiling with -Wmissing-include-dirs g++ complains about:
    /usr/X11R6/include: No such file or directory [-Werror]

    If not using it on Ubuntu14.04 my QtGui-Application seems to run fine. Is my guess correct, that those included are resolved by the QtGui-Library if using it, and I only would need that flag if I would make use of the X11-development files?


  • Qt Champions 2017

    @kodiak32 said in What does CONFIG += x11 actually do?:

    I only would need that flag if I would make use of the X11-development files?

    Yes. Just ignore it (don't set the config value) for the most of cases.


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