[Solved]"cannot find -lGL" error



  • Hello All,

    This is my first first here. I am basically a Java and python programmer. I know C++ but today I decided to learn to use Qt to make GUI in C++.

    I have installed QtCreator and QT Libraries using online installer on fedora 16.

    I want to make a simple GUI at first. I dragged a button and a label on the form and on click the button it would show Hello world on the label.

    But when I build the project it shows an error "cannot find -lGL"

    @17:27:16: Running steps for project HelloWorld...
    17:27:16: Configuration unchanged, skipping qmake step.
    17:27:16: Starting: "/usr/bin/make"
    g++ -Wl,-rpath,/opt/Qt/5.1.0/gcc_64 -Wl,-rpath,/opt/Qt/5.1.0/gcc_64/lib -o HelloWorld main.o mainwindow.o moc_mainwindow.o -L/opt/Qt//5.1.0/gcc_64/lib -lQt5Widgets -lQt5Gui -lQt5Core -lGL -lpthread
    /usr/bin/ld: cannot find -lGL
    collect2: ld returned 1 exit status
    make: *** [HelloWorld] Error 1
    17:27:16: The process "/usr/bin/make" exited with code 2.
    Error while building/deploying project HelloWorld (kit: Desktop Qt 5.1.0 GCC 64bit)
    When executing step 'Make'
    17:27:16: Elapsed time: 00:00.@

    The above is the compiler output I get. Please help and guide me how to solve it.

    Thank you,
    Sincerely,
    Psycho_Coder



  • Looks like you need to install the development libraries of OpenGL.

    I've never used Fedora. Maybe sudo apt-get install libgl-dev will do the trick.



  • [quote author="Skyrpex" date="1377605874"]Looks like you need to install the development libraries of OpenGL.

    I've never used Fedora. Maybe sudo apt-get install libgl-dev will do the trick.[/quote]
    Well I used Ubuntu earlier. But now I use fedora, actually its been 4 days since I booted fedora.
    I am at present downloading some OpenGL libraries but I don't know if they will work.

    Do you know any particular package for fedora I mean equivalent package.


  • Lifetime Qt Champion

    Hi,
    IIRC something like

    @yum install mesa-libGL-devel@



  • [quote author="SGaist" date="1377616658"]Hi,
    IIRC something like

    @yum install mesa-libGL-devel@[/quote]

    Thanks a lot I did that and now its working fine.

    [quote author="Skyrpex" date="1377605874"]Looks like you need to install the development libraries of OpenGL.

    I've never used Fedora. Maybe sudo apt-get install libgl-dev will do the trick.[/quote]

    Thank you for your reply as this worked fine.


  • Lifetime Qt Champion

    You're welcome !

    Don't forget to update the thread's title prepending solved so other forum users will know a solution has been found :)



  • [quote author="SGaist" date="1377620428"]You're welcome !

    Don't forget to update the thread's title prepending solved so other forum users will know a solution has been found :)[/quote]

    I have did it. Thanks. Actually I am not new to forum system. I have to many forums and I am active in some forums. But those are mybb and SimpleMachines or phpBB forums and whenever a thread is solved a moderator marks it as solved. So I thought that there must be some kind of system like that.

    However from now I will do as you said.


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