4. QMYSQL driver not loaded on Ubuntu

QMYSQL driver not loaded on Ubuntu


  • Hello everybody i get and installed Qt 5.2 x64 edition for Linux ubuntu.

    I have QTPLUGIN += qsqlmysql and QT += sql in file .pro

    and libqsqlmysql.so plugin is in /opt/Qt5.2.0/5.2.0/gcc_64/plugins/sqldrivers folder but after run show me errors...

    QSqlDatabase: QMYSQL driver not loaded
    QSqlDatabase: available drivers: QSQLITE QMYSQL QMYSQL3 QSQLITE2 QPSQL7 QPSQL

    why ? how I can fix this error?

    0
  • Lifetime Qt Champion

    Hi,

    Do you also have the MySql libraries installed on your OS ?

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  • Yes !

    root@Gigabyte-Z68P-DS3:~# dpkg --list|grep mysql
    ii libmysql++-dev 3.1.0-2 amd64 MySQL C++ library bindings (development)
    ii libmysql++3 3.1.0-2 amd64 MySQL C++ library bindings (runtime)
    ii libmysqlclient-dev 5.5.34-0ubuntu0.13.10.1 amd64 MySQL database development files
    ii libmysqlclient18:amd64 5.5.34-0ubuntu0.13.10.1 amd64 MySQL database client library
    ii libmysqlclient18:i386 5.5.34-0ubuntu0.13.10.1 i386 MySQL database client library
    ii libmysqlcppconn-dev 1.1.3-3 amd64 MySQL Connector for C++ (development files)
    ii libmysqlcppconn7 1.1.3-3 amd64 MySQL Connector for C++ (library)
    ii libqt4-sql-mysql:amd64 4:4.8.4+dfsg-0ubuntu18.1 amd64 Qt 4 MySQL database driver
    ii libqt4-sql-mysql:i386 4:4.8.4+dfsg-0ubuntu18.1 i386 Qt 4 MySQL database driver
    ii libqt5sql5-mysql:amd64 5.0.2+dfsg1-7ubuntu11.1 amd64 Qt 5 MySQL database driver
    ii mysql-common 5.5.34-0ubuntu0.13.10.1 all MySQL database common files, e.g. /etc/mysql/my.cnf

    0
  • Lifetime Qt Champion

    And what do you get if your run ldd on Qt's mysql plugin ?

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  • I don't understand ! I,m new on Qt ...
    Of course I use XAMPP for testing MySQL Database.

    my code for test on console app :

    @
    #include <QCoreApplication>
    #include <QtSql/QSqlDatabase>
    #include <QtSql>
    #include <QDebug>

    //remplacer l'affichage par la commande cout
    #define q2c(string) string.toStdString()

    int main(int argc, char *argv[])
    {
    QCoreApplication a(argc, argv);

    QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL"); // This is the line I got error
   db.setHostName("localhost");
   db.setDatabaseName("qtdatabase");
   db.setUserName("root");
   db.setPassword("");
   bool ok = db.open();

return a.exec&#40;&#41;;

    }

    @

    return this errors :

    QSqlDatabase: QMYSQL driver not loaded
    QSqlDatabase: available drivers: QSQLITE QSQLITE2 QMYSQL QMYSQL3 QPSQL7 QPSQL

    but with this code :

    @
    #include <QCoreApplication>
    #include <QtSql/qsql.h>
    #include <QtSql/qsqldatabase.h>
    #include <QtSql/QSqlError>
    #include <QtSql/QSqlQuery>
    #include <QDebug>

    int main(int argc, char *argv[])
    {
    QCoreApplication a(argc, argv);

    QStringList drivers = QSqlDatabase::drivers();
    for(int i = 0; i < drivers.count(); i++)
        qDebug() << drivers.at(i);

return a.exec(&#41;;

    }

    @

    return this output:

    "QMYSQL","QMYSQL3" and ...

    0
  • Lifetime Qt Champion

    Qt's MySql plugin is call libqsqlmysql.so, call ldd on it and check that it can find all dependencies

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  • [quote author="SGaist" date="1388524196"]Qt's MySql plugin is call libqsqlmysql.so, call ldd on it and check that it can find all dependencies[/quote]

    what is your mean of ldd ? I have libqsqlmysql.so file in below address :

    /opt/Qt5.2.0/5.2.0/gcc_64/plugins/sqldrivers

    0
  • Lifetime Qt Champion

    ldd is a little utility that lists the dependencies of an executable/dynamic library

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  • [quote author="SGaist" date="1388526680"]ldd is a little utility that lists the dependencies of an executable/dynamic library[/quote]

    How can I check this option ? This is installed utility on OS or Qt ?
    Please give me more information about this.
    How to call ldd?

    I now install Qt on Windows for check my problem but now show error for load..

    Qt_5_2_0_MinGW_32bit edition:

    Starting C:\Users\Kambiz\Documents\Qt\build-untitled16-Desktop_Qt_5_2_0_MinGW_32bit-Debug\debug\untitled16.exe...
    QSqlDatabase: QMYSQL driver not loaded
    QSqlDatabase: available drivers: QSQLITE QMYSQL QMYSQL3 QODBC QODBC3 QPSQL QPSQL7
    C:\Users\Kambiz\Documents\Qt\build-untitled16-Desktop_Qt_5_2_0_MinGW_32bit-Debug\debug\untitled16.exe exited with code 0

    Qt_5_2_0_MSVC2012_64bit edition:
    Starting C:\Users\Kambiz\Documents\Qt\build-untitled15-Desktop_Qt_5_2_0_MSVC2012_64bit-Debug\debug\untitled15.exe...
    QSqlDatabase: QMYSQL driver not loaded

    0
  • Lifetime Qt Champion

    "here":http://bit.ly/1l2bNYY

    Did you install MySQL on Windows ? Do you have the MySql dll somewhere accessible in your PATH ?

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  • [quote author="SGaist" date="1388613736"]"here":http://bit.ly/1l2bNYY

    Did you install MySQL on Windows ? Do you have the MySql dll somewhere accessible in your PATH ?[/quote]

    Yes I have it on below path :

    C:\Program Files\MySQL\MySQL Server 5.6
    and
    C:\Program Files (X86) \MySQL\MySQL Server 5.6

    and on Linux ubuntu too

    On Windows I use of qt-windows-opensource-5.2.0-mingw48_opengl-x86-offline.exe and qt-windows-opensource-5.2.0-msvc2012-x86_64-offline.exe

    but I don't know why doesn't work :(

    0
  • Lifetime Qt Champion

    You didn't answer the questions:
    What does ldd return ?

    Is the MySql dll folder in your PATH variable ? Or at least in the PATH environment variable in the run section of the Project panel in Qt Creator ?

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  • For Windows...

    MySql dll folder :
    I have libmysql.dll and libmysql.lib and mysqlclient.lib here C:\Program Files\MySQL\MySQL Server 5.6\lib

    and I have qsqlmysql.dll and qsqlmysqld.dll and other files in here :

    C:\Qt\Qt5.2.0-MG\5.2.0\mingw48_32\plugins\sqldrivers
    and
    C:\Qt\Qt5.2.0\5.2.0\msvc2012_64\plugins\sqldrivers

    0

  • and For Linux about ldd :

    root@Gigabyte-Z68P-DS3:~# ldd /bin/date
    linux-vdso.so.1 => (0x00007fff31d72000)
    librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f0ea438c000)
    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f0ea3fc4000)
    libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f0ea3da6000)
    /lib64/ld-linux-x86-64.so.2 (0x00007f0ea45b5000)

    and about MySQL plugin folder and files:

    in here :

    /opt/Qt5.2.0/5.2.0/gcc_64/plugins/sqldrivers .... I have libqsqlmysql.so

    0
  • Lifetime Qt Champion

    I know where your dlls are. If using 64bit, the question is: is "C:\Program Files\MySQL\MySQL Server 5.6\lib" contained in the PATH environment variable in the Run section on the Project panel in Qt Creator ?

    I didn't ask you to run ldd on /bin/date but on your Qt 5.2.0 libqsqlmysql.so

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  • [quote author="SGaist" date="1388785738"]I know where your dlls are. If using 64bit, the question is: is "C:\Program Files\MySQL\MySQL Server 5.6\lib" contained in the PATH environment variable in the Run section on the Project panel in Qt Creator ?
    [/quote]

    OMG! NO...
    Sorry ! I forget PATH environment variable !!! now my problem is sloved on Windows by add PATH environment variable for Mysql :)

    but for linux ?! can you give me more information ?

    0
  • Lifetime Qt Champion

    You already have all the information: call "ldd /opt/Qt5.2.0/5.2.0/gcc_64/plugins/sqldrivers/libqsqlmysql.so"

    to see what libraries it links to

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  • [quote author="SGaist" date="1388788157"]You already have all the information: call "ldd /opt/Qt5.2.0/5.2.0/gcc_64/plugins/sqldrivers/libqsqlmysql.so"

    to see what libraries it links to[/quote]

    This is :

    root@Gigabyte-Z68P-DS3:~# ldd /opt/Qt5.2.0/5.2.0/gcc_64/plugins/sqldrivers/libqsqlmysql.so
    linux-vdso.so.1 => (0x00007fff2c89b000)
    libmysqlclient_r.so.16 => not found
    libQt5Sql.so.5 => /opt/Qt5.2.0/5.2.0/gcc_64/plugins/sqldrivers/../../lib/libQt5Sql.so.5 (0x00007f23cac7a000)
    libQt5Core.so.5 => /opt/Qt5.2.0/5.2.0/gcc_64/plugins/sqldrivers/../../lib/libQt5Core.so.5 (0x00007f23ca5ac000)
    libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f23ca2a8000)
    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f23c9ee0000)
    libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f23c9cc2000)
    libicui18n.so.51 => /opt/Qt5.2.0/5.2.0/gcc_64/plugins/sqldrivers/../../lib/libicui18n.so.51 (0x00007f23c98a9000)
    libicuuc.so.51 => /opt/Qt5.2.0/5.2.0/gcc_64/plugins/sqldrivers/../../lib/libicuuc.so.51 (0x00007f23c9523000)
    libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f23c931e000)
    libgthread-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libgthread-2.0.so.0 (0x00007f23c911c000)
    librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f23c8f14000)
    libglib-2.0.so.0 => /lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007f23c8c12000)
    libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f23c890e000)
    libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f23c86f8000)
    /lib64/ld-linux-x86-64.so.2 (0x00007f23cb0ec000)
    libicudata.so.51 => /opt/Qt5.2.0/5.2.0/gcc_64/plugins/sqldrivers/../../lib/libicudata.so.51 (0x00007f23c6fae000)
    libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007f23c6d6f000)
    root@Gigabyte-Z68P-DS3:~#

    0
  • Lifetime Qt Champion

    You have it on the second line:

    @libmysqlclient_r.so.16 => not found@

    Check what version number of libmysqlclient_r you have installed

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  • [quote author="SGaist" date="1388870467"]You have it on the second line:

    @libmysqlclient_r.so.16 => not found@

    Check what version number of libmysqlclient_r you have installed[/quote]

    root@Gigabyte-Z68P-DS3:~# dpkg --get-selections | grep mysql
    libmysql++-dev install
    libmysql++3 install
    libmysqlclient-dev install
    libmysqlclient18:amd64 install
    libmysqlclient18:i386 install
    libmysqlcppconn-dev install
    libmysqlcppconn7 install
    libqt4-sql-mysql:amd64 install
    libqt4-sql-mysql:i386 install
    libqt5sql5-mysql:amd64 install
    mysql-client-core-5.5 install
    mysql-common install
    root@Gigabyte-Z68P-DS3:~#

    0
  • Lifetime Qt Champion

    You have the version 18 and not the 16.

    So two solutions here:

    1. find the version 16
    2. build the Qt MySQL plugin yourself with this version of the client library (best)

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  • [quote author="SGaist" date="1388875572"]You have the version 18 and not the 16.

    So two solutions here:

    find the version 16

    build the Qt MySQL plugin yourself with this version of the client library (best)[/quote]

    Sorry , but can you help me for find or build qt mysql plugin ?
    I run this command : root@Gigabyte-Z68P-DS3:/opt/Qt5.2.0/5.2.0/Src/qtbase/src/plugins/sqldrivers/mysql# qmake "INCLUDEPATH+=/usr/include/mysql" "LIBS+=-L/usr/lib/mysql -lmysqlclient_r" mysql.pro

    I think my command is not true ! in QT 5.2 any folders and roots is different...

    0
  • Lifetime Qt Champion

    did you call make after that ?

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  • I run first this command : root@Gigabyte-Z68P-DS3:~# cd /opt/Qt5.2.0/5.2.0/Src/qtbase/src/plugins/sqldrivers/mysql

    after :

    root@Gigabyte-Z68P-DS3:/opt/Qt5.2.0/5.2.0/Src/qtbase/src/plugins/sqldrivers/mysql# qmake "INCLUDEPATH+=/usr/include/mysql" "LIBS+=-L/usr/lib/mysql -lmysqlclient_r" mysql.pro
    qmake: could not find a Qt installation of ''
    root@Gigabyte-Z68P-DS3:/opt/Qt5.2.0/5.2.0/Src/qtbase/src/plugins/sqldrivers/mysql#

    0
  • Lifetime Qt Champion

    Are you sure you are using the right qmake ?

    Also, why are you developing as root ?

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  • [quote author="SGaist" date="1388958771"]Are you sure you are using the right qmake ?

    Also, why are you developing as root ?[/quote]

    I,m not sure ! for this reason I need to help. :D

    0
  • Lifetime Qt Champion

    what does qmake --version and which qmake return ?

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  • [quote author="SGaist" date="1389045618"]what does qmake --version and which qmake return ?[/quote]

    root@Gigabyte-Z68P-DS3:~# dpkg --get-selections | grep qmake
    qt5-qmake install

    and return : qmake: could not find a Qt installation of ''

    0
  • Lifetime Qt Champion

    Check what other Qt 5 package you have installed

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  • Please see this :

    root@Gigabyte-Z68P-DS3:~# dpkg --get-selections | grep qt
    appmenu-qt install
    appmenu-qt5 install
    checkbox-qt install
    libaccounts-qt5-1 install
    libdbusmenu-qt2:amd64 install
    libdbusmenu-qt2:i386 install
    libdbusmenu-qt5:amd64 install
    libqt4-dbus:amd64 install
    libqt4-dbus:i386 install
    libqt4-declarative:amd64 install
    libqt4-declarative:i386 install
    libqt4-designer:amd64 install
    libqt4-help:amd64 install
    libqt4-network:amd64 install
    libqt4-network:i386 install
    libqt4-opengl:amd64 install
    libqt4-opengl:i386 install
    libqt4-script:amd64 install
    libqt4-script:i386 install
    libqt4-scripttools:amd64 install
    libqt4-sql:amd64 install
    libqt4-sql:i386 install
    libqt4-sql-mysql:amd64 install
    libqt4-sql-mysql:i386 install
    libqt4-sql-sqlite:amd64 install
    libqt4-svg:amd64 install
    libqt4-test:amd64 install
    libqt4-webkit install
    libqt4-xml:amd64 install
    libqt4-xml:i386 install
    libqt4-xmlpatterns:amd64 install
    libqt4-xmlpatterns:i386 install
    libqt53d5:amd64 install
    libqt5core5:amd64 install
    libqt5dbus5:amd64 install
    libqt5gui5:amd64 install
    libqt5location5:amd64 install
    libqt5network5:amd64 install
    libqt5opengl5:amd64 install
    libqt5printsupport5:amd64 install
    libqt5qml5:amd64 install
    libqt5quick5:amd64 install
    libqt5sensors5:amd64 install
    libqt5sql5:amd64 install
    libqt5sql5-mysql:amd64 install
    libqt5sql5-sqlite:amd64 install
    libqt5test5:amd64 install
    libqt5v8-5:amd64 install
    libqt5webkit5:amd64 install
    libqt5widgets5:amd64 install
    libqt5xml5:amd64 install
    libqtassistantclient4:amd64 install
    libqtcore4:amd64 install
    libqtcore4:i386 install
    libqtgui4:amd64 install
    libqtgui4:i386 install
    libqtwebkit4:amd64 install
    libqtwebkit4:i386 install
    libsignon-qt5-1 install
    python-qt4 install
    python-qt4-dbus install
    qt-at-spi:amd64 install
    qt5-qmake install
    qtchooser install
    sni-qt:amd64 install
    sni-qt:i386 install
    ubuntu-sso-client-qt install
    ubuntuone-control-panel-qt install
    root@Gigabyte-Z68P-DS3:~#

    0
  • Lifetime Qt Champion

    Do you also have the dev package installed ?

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  • here :

    root@Gigabyte-Z68P-DS3:~# dpkg --get-selections | grep dev

    comerr-dev install
    dpkg-dev install
    freeglut3-dev:amd64 install
    gir1.2-gudev-1.0 install
    krb5-multidev install
    libalut-dev install
    libasprintf-dev:amd64 install
    libboost1.53-dev:amd64 install
    libc-dev-bin install
    libc6-dev:amd64 install
    libdevmapper-event1.02.1:amd64 install
    libdevmapper1.02.1:amd64 install
    libdrm-dev:amd64 install
    libfreetype6-dev install
    libgcc-4.8-dev:amd64 install
    libgettextpo-dev:amd64 install
    libgfortran-4.8-dev:amd64 install
    libgl1-mesa-dev install
    libgl2ps-dev install
    libglu1-mesa-dev install
    libgudev-1.0-0:amd64 install
    libice-dev:amd64 install
    libimobiledevice4 install
    libkrb5-dev install
    libmtdev1:amd64 install
    libmysql++-dev install
    libmysqlclient-dev install
    libmysqlcppconn-dev install
    libopenal-dev:amd64 install
    libpcre3-dev:amd64 install
    libpthread-stubs0-dev:amd64 install
    libroot-core-dev install
    libroot-geom-dev install
    libroot-graf2d-gpad-dev install
    libroot-graf2d-graf-dev install
    libroot-graf3d-gl-dev install
    libroot-gui-dev install
    libroot-hist-dev install
    libroot-io-dev install
    libroot-math-mathcore-dev install
    libroot-math-matrix-dev install
    libroot-net-dev install
    libroot-proof-dev install
    libroot-tree-dev install
    libsm-dev:amd64 install
    libssl-dev:amd64 install
    libstdc++-4.8-dev:amd64 install
    libudev1:amd64 install
    libudev1:i386 install
    libv4l-dev:amd64 install
    libx11-dev:amd64 install
    libx11-xcb-dev install
    libxau-dev:amd64 install
    libxcb-dri2-0-dev:amd64 install
    libxcb-glx0-dev:amd64 install
    libxcb1-dev:amd64 install
    libxdamage-dev:amd64 install
    libxdmcp-dev:amd64 install
    libxext-dev:amd64 install
    libxfixes-dev:amd64 install
    libxpm-dev:amd64 install
    libxt-dev:amd64 install
    libxxf86vm-dev:amd64 install
    linux-libc-dev:amd64 install
    makedev install
    manpages-dev install
    mesa-common-dev install
    python-dbus-dev install
    system-config-printer-udev install
    udev install
    unity-scope-devhelp install
    x11proto-core-dev install
    x11proto-damage-dev install
    x11proto-dri2-dev install
    x11proto-fixes-dev install
    x11proto-gl-dev install
    x11proto-input-dev install
    x11proto-kb-dev install
    x11proto-xext-dev install
    x11proto-xf86vidmode-dev install
    xserver-xorg-input-evdev install
    xserver-xorg-video-fbdev install
    xtrans-dev install
    zlib1g-dev:amd64 install
    root@Gigabyte-Z68P-DS3:~#

    0
  • Lifetime Qt Champion

    I don't see any Qt related dev package

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  • How can I install Qt related dev package ?

    0
  • Lifetime Qt Champion

    IIRC you can install qt5-default then the same qt5 packages with a trailing -dev in the name

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  • See now i installed qt dev package :

    ...
    ...
    qtbase5-dev:amd64 install
    qtbase5-dev-tools install
    qtdeclarative5-dev install

    Check latest lines...

    root@Gigabyte-Z68P-DS3:~# aptitude show qt5-default
    Package: qt5-default
    State: installed
    Automatically installed: no
    Multi-Arch: same
    Version: 5.0.2+dfsg1-7ubuntu11.1
    Priority: optional
    Section: libs
    Maintainer: Ubuntu Developers ubuntu-devel-discuss@lists.ubuntu.com
    Architecture: amd64
    Uncompressed Size: 93.2 k
    Depends: qtbase5-dev, qtchooser
    Suggests: qt5-qmake, qtbase5-dev-tools
    Conflicts: qt4-default, qt4-default
    Breaks: qt5-default (!= 5.0.2+dfsg1-7ubuntu11.1)
    Replaces: qt5-default (< 5.0.2+dfsg1-7ubuntu11.1)
    Provides: qt-default
    Description: Qt 5 development defaults package
    Qt is a cross-platform C++ application framework. Qt's primary feature is its rich set of widgets
    that provide standard GUI functionality.

    This package sets Qt 5 to be the default Qt version to be used when using development binaries like
    qmake. It provides a default configuration for qtchooser, but does not prevent alternative Qt
    installations from being used.
    Homepage: http://qt-project.org/

    root@Gigabyte-Z68P-DS3:~# dpkg --get-selections | grep dev
    comerr-dev install
    dpkg-dev install
    freeglut3-dev:amd64 install
    gir1.2-gudev-1.0 install
    krb5-multidev install
    libalut-dev install
    libasprintf-dev:amd64 install
    libboost1.53-dev:amd64 install
    libc-dev-bin install
    libc6-dev:amd64 install
    libdevmapper-event1.02.1:amd64 install
    libdevmapper1.02.1:amd64 install
    libdrm-dev:amd64 install
    libfreetype6-dev install
    libgcc-4.8-dev:amd64 install
    libgettextpo-dev:amd64 install
    libgfortran-4.8-dev:amd64 install
    libgl1-mesa-dev install
    libgl2ps-dev install
    libglu1-mesa-dev install
    libgudev-1.0-0:amd64 install
    libice-dev:amd64 install
    libimobiledevice4 install
    libkrb5-dev install
    libmtdev1:amd64 install
    libmysql++-dev install
    libmysqlclient-dev install
    libmysqlcppconn-dev install
    libopenal-dev:amd64 install
    libpcre3-dev:amd64 install
    libpthread-stubs0-dev:amd64 install
    libqt5opengl5-dev:amd64 install
    libroot-core-dev install
    libroot-geom-dev install
    libroot-graf2d-gpad-dev install
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    xserver-xorg-input-evdev install
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    xtrans-dev install
    zlib1g-dev:amd64 install
    root@Gigabyte-Z68P-DS3:~#

    0
  • Lifetime Qt Champion

    Did you retry to run qmake now ?

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    0

  • [quote author="SGaist" date="1389256104"]Did you retry to run qmake now ?[/quote]

    Ok...

    Yes... please see again an error:

    root@Gigabyte-Z68P-DS3:/opt/Qt5.2.0/5.2.0/Src/qtbase/src/plugins/sqldrivers/mysql# qmake "INCLUDEPATH+=/usr/include/mysql" "LIBS+=-L/usr/lib/mysql -lmysqlclient_r" mysql.pro

    Project ERROR: addExclusiveBuilds() requires at least two arguments

    0
  • Lifetime Qt Champion

    Since you installed Qt 5.2 Why didn't you use the qmake from that Qt rather than the one from the system ?

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    0

  • Well , I want to build mysql plugin for Qt 5.2 !
    I get error message : QMySQL driver not found loaded.

    I try test with a minimal code :

    Main :

    @
    #include <QCoreApplication>
    #include <QtSql/QSqlDatabase>
    #include <QtSql>
    #include <QDebug>

    //remplacer l'affichage par la commande cout
    #define q2c(string) string.toStdString()

    int main(int argc, char *argv[])
    {
    QCoreApplication a(argc, argv);

    QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");
   db.setHostName("localhost");
   db.setDatabaseName("qtdatabase");
   db.setUserName("root");
   db.setPassword("");
   bool ok = db.open();

return a.exec&#40;&#41;;

    }

    @

    and .pro :

    @
    #-------------------------------------------------

    Project created by QtCreator 2014-01-01T09:22:46

    #-------------------------------------------------

    QT += core
    QT += sql
    QT -= gui

    TARGET = untitled18
    CONFIG += console
    CONFIG -= app_bundle

    QTPLUGIN += qsqlmysql
    TEMPLATE = app

    SOURCES += main.cpp

    @

    0
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