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Thread: Undefined Reference QwtPlot::QwtPlot(QWidget*)

  1. #1
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    Question Undefined Reference QwtPlot::QwtPlot(QWidget*)

    Hi,

    I am using Ubuntu 9.04 with the qt4, qt creator and installed qwt using the synaptic manager. Looked like everything worked fine for me. The Designer has the new plugins.

    Started a new project and added a plot widget to a dialog, but when I am trying to compile it fails because it cannot include #include "qwt_plot.h"

    I know how to add new include paths in visual studio but I have no idea how to do that in QTCreator or does somethin different went wrong ?

    Thanks in advance for your help

    kind regards


    loco

    EDIT:
    Ok this is what I did:

    copying the *.h files in src/ to /usr/local/include/:
    Qt Code:
    1. # cp src/*.h /usr/local/include
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    copying those in lib/ to /usr/local/lib/.
    Qt Code:
    1. cd lib && tar -cf l.tar *
    2. #
    3. # mv l.tar /usr/local/lib
    4. # cd /usr/local/lib
    5. # tar xf l.tar
    6. # rm l.tar
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    running ldconfig:
    Qt Code:
    1. #ldconfig
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    No more include error but another one appears:
    Qt Code:
    1. "undefined reference QwtPlot::QwtPlot(QWidget*)"
    To copy to clipboard, switch view to plain text mode 

    Any suggestions ? Sounds like the libs are missing
    Last edited by 27Loco; 24th April 2009 at 13:08.

  2. #2
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    Default Re: Undefined Reference QwtPlot::QwtPlot(QWidget*)

    Take a look at the examples shipped with Qwt (specifically their .pro files). You need to link to the Qwt library.
    J-P Nurmi

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    Default Re: Undefined Reference QwtPlot::QwtPlot(QWidget*)

    Can't compile samples with the QT Creator. I am getting a lot of

    Qt Code:
    1. undefined reference: QwtScaleMap::QwtScaleMap()
    To copy to clipboard, switch view to plain text mode 

    Somethin' gone wrong. Any great installations guides ? Found nothin' helpful for now.

    Thanks

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    Thumbs up [SOLVED] Undefined Reference QwtPlot::QwtPlot(QWidget*)

    Ok finally i managed to install Qwt on Ubuntu 9.04 and run the examples. It is really simple once you figured out how to install the whole thing. I will post it my step by step guide


    1. Go to http://sourceforge.net/projects/qwt and download the tar.gz file
    2. Extract the package into your home folder \home\YOU\Qwt-5.2.0
    3. Open the Terminal and change into the Qwt directory

    Qt Code:
    1. cd 'home\YOU\Qwt-5.2.0'
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    Then

    Qt Code:
    1. qmake
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    Qt Code:
    1. sudo make
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    Qt Code:
    1. sudo make install
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    Okay. Now we have to link the shared libraries. Go to the following folder
    \etc\ld.so.conf.d and open the file libc.conf

    Something like
    Qt Code:
    1. # libc default configuration
    2. /usr/local/lib
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    should be in there. Add the line
    Qt Code:
    1. /usr/local/qwt-5.2.0/lib
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    Save and close the file. Now lets go back to the terminal.
    Simply enter

    Qt Code:
    1. sudo ldconfig
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    To test everything change the path of the terminal to the examples path of qwt and run qmake and make again

    Qt Code:
    1. cd \home\YOU\Qwt-5.2.0\examples
    2. qmake
    3. sudo make
    To copy to clipboard, switch view to plain text mode 

    now open the examples.pro file with the qcreator and everything should work fine.
    Last edited by 27Loco; 26th April 2009 at 17:52. Reason: Title Change

  5. The following user says thank you to 27Loco for this useful post:

    PaceyIV (14th May 2009)

  6. #5
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    Default Re: Undefined Reference QwtPlot::QwtPlot(QWidget*)

    There's no need to compile with super user privileges.
    J-P Nurmi

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    Default Re: Undefined Reference QwtPlot::QwtPlot(QWidget*)

    I had to because the folder the files were created to was locked for the normal user ^^. But yes you are right

  8. #7
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    Default Re: [SOLVED] Undefined Reference QwtPlot::QwtPlot(QWidget*)

    Great! Thanks!

    I change only one step of your tutorial.

    Instead of add the line /usr/local/qwt-5.2.0/lib in the libc.conf I create the new file qwt.conf in the same directory.

    Just a question: what lines you need to use in the project.pro file?

    I need to add this:

    INCLUDEPATH += /usr/local/qwt-5.2.0-svn/include/
    LIBS += /usr/local/qwt-5.2.0-svn/lib/libqwt.so.5

    I also try to use CONFIG += Qwt but don't work.

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