%general-entities; ]> KDE Frameworks Introduction KF6 can be installed in /usr or /opt/kf6. The BLFS editors recommend the latter in the BLFS environment. 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 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 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 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/python&python3-majorver;/site-packages PYTHONPATH pathappend $KF6_PREFIX/share/man MANPATH 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 /etc/ld.so.conf 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 Several KDE Frameworks and KDE Plasma packages install files into D-Bus, Polkit, and systemd directories. When installing KDE 6 in a location other than /usr, D-Bus, Polkit, and systemd 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 && install -v -dm755 $KF6_PREFIX/lib && ln -sfv /usr/lib/systemd $KF6_PREFIX/lib 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 . 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 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-&kf6-version;. After installing KDE Frameworks, you may rename the directory and create a symlink: mv /opt/kf6{,-&kf6-version;} ln -sfv kf6-&kf6-version; /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.