#### Beyond Linux® From Scratch (System V Edition) - Version 12.3

### Chapter 30. KDE Frameworks 6

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# KDE Frameworks 6 Pre-installation Configuration

KF6 can be installed in `/usr` or `/opt/kf6`. The BLFS editors recommend the latter in the BLFS environment.

## Installing in /usr

One option is to install KDE Frameworks into the `/usr` hierarchy. This creates a simpler setup but makes it more difficult to try multiple versions of KDE Frameworks.

    export KF6_PREFIX=/usr

It is a good idea to add the following variables to your system or personal profiles:

    cat >> /etc/profile.d/qt6.sh << "EOF"
    # Begin kf6 extension for /etc/profile.d/qt6.sh

    pathappend /usr/lib/plugins        QT_PLUGIN_PATH
    pathappend $QT6DIR/lib/plugins     QT_PLUGIN_PATH

    pathappend /usr/lib/qt6/qml        QML2_IMPORT_PATH
    pathappend $QT6DIR/lib/qml         QML2_IMPORT_PATH

    # End extension for /etc/profile.d/qt6.sh
    EOF

    cat > /etc/profile.d/kf6.sh << "EOF"
    # Begin /etc/profile.d/kf6.sh

    export KF6_PREFIX=/usr

    # End /etc/profile.d/kf6.sh
    EOF

### Note

If qt6 was installed in `/usr`, the `$QT6DIR/lib/` portions of the above paths may need to be changed to `$QT6DIR/lib/qt6/`.

Additionally, if Sudo-1.9.16p2 is installed, these variables should be available to the super user. Execute the following commands as the `root` user:

    cat >> /etc/sudoers.d/qt << "EOF"
    Defaults env_keep += QT_PLUGIN_PATH
    Defaults env_keep += QML2_IMPORT_PATH
    EOF

    cat >> /etc/sudoers.d/kde << "EOF"
    Defaults env_keep += KF6_PREFIX
    EOF

## Installing in /opt

A method of building multiple versions installs KDE Frameworks in the `/opt` hierarchy:

    export KF6_PREFIX=/opt/kf6

If you are not installing KDE Frameworks in `/usr`, you will need to make some additional configuration changes. Best practice is to add those to your system or personal profile:

    cat > /etc/profile.d/kf6.sh << "EOF"
    # Begin /etc/profile.d/kf6.sh

    export KF6_PREFIX=/opt/kf6

    pathappend $KF6_PREFIX/bin              PATH
    pathappend $KF6_PREFIX/lib/pkgconfig    PKG_CONFIG_PATH

    pathappend $KF6_PREFIX/etc/xdg          XDG_CONFIG_DIRS
    pathappend $KF6_PREFIX/share            XDG_DATA_DIRS

    pathappend $KF6_PREFIX/lib/plugins      QT_PLUGIN_PATH
    pathappend $KF6_PREFIX/lib/plugins/kcms QT_PLUGIN_PATH

    pathappend $KF6_PREFIX/lib/qml          QML2_IMPORT_PATH

    pathappend $KF6_PREFIX/lib/python3.13/site-packages PYTHONPATH

    pathappend $KF6_PREFIX/include          CPLUS_INCLUDE_PATH
    # End /etc/profile.d/kf6.sh
    EOF

    cat >> /etc/profile.d/qt6.sh << "EOF"
    # Begin Qt6 changes for KF6

    pathappend /usr/lib/plugins            QT_PLUGIN_PATH
    pathappend $QT6DIR/plugins             QT_PLUGIN_PATH
    pathappend $QT6DIR/qml                 QML2_IMPORT_PATH

    # End Qt6 changes for KF6
    EOF

Expand your `/etc/ld.so.conf` file:

    cat >> /etc/ld.so.conf << "EOF"
    # Begin KF6 addition

    /opt/kf6/lib

    # End KF6 addition
    EOF

Several KDE Frameworks and Plasma packages install files into D-Bus and Polkit directories. When installing KDE Frameworks in a location other than `/usr`, D-Bus and Polkit need to be able to find these files. The easiest way to achieve this is to create the following symlinks (as the `root` user):

    install -v -dm755           $KF6_PREFIX/{etc,share} &&
    ln -sfv /etc/dbus-1         $KF6_PREFIX/etc         &&
    ln -sfv /usr/share/dbus-1   $KF6_PREFIX/share       &&
    ln -sfv /usr/share/polkit-1 $KF6_PREFIX/share

Some packages may also install icons from the "hicolor" icon set. Since that icon set is used by many packages, it is a good idea to create a symlink to the one in `/usr/share` to avoid having multiple installations of hicolor-icon-theme-0.18. Run the following commands as the `root` user:

    install -v -dm755                $KF6_PREFIX/share/icons &&
    ln -sfv /usr/share/icons/hicolor $KF6_PREFIX/share/icons

### Tip

Sometimes, the installation paths are hardcoded into installed files. This is the reason why `/opt/kf6` is used as installation prefix instead of `/opt/kf6-6.11.0`. After installing KDE Frameworks, you may rename the directory and create a symlink:

    mv /opt/kf6{,-6.11.0}
    ln -sfv kf6-6.11.0 /opt/kf6

Later on, you may want to install other versions of KDE Frameworks. To do that, just remove the symlink and use `/opt/kf6` as the prefix again. Which version of KDE Frameworks you use depends only on where the symlink points. No other reconfiguration will be needed.

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