Index: kde/kf6/kf6-intro.xml
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--- kde/kf6/kf6-intro.xml	(revision f9bfb7d64de6b091abdd6ec843f53bf8ca1a1507)
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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
+  "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
+ <!ENTITY % general-entities SYSTEM "../../general.ent">
+ %general-entities;
+
+  <!ENTITY kf6-download-http "&kf6-download-http;">
+  <!ENTITY kf6-download-ftp  " ">
+  <!ENTITY kf6-md5sum        "See Below">
+  <!ENTITY kf6-size          "30 MB">
+  <!ENTITY kf6-buildsize     "11.7 MB">
+  <!ENTITY kf6-time          "0.4 SBU">
+]>
+
+<sect1 id="kf6-intro" xreflabel="Introduction to KF6">
+  <?dbhtml filename="kf6-intro.html"?>
+
+
+  <title>KDE Frameworks 6 Pre-installation Configuration</title>
+
+  <indexterm zone="kf6-intro">
+     <primary sortas="g-kf6">KDE Frameworks Introduction</primary>
+  </indexterm>
+
+  <para>
+    KF6 can be installed in <filename class="directory">/usr</filename> or
+    <filename class="directory">/opt/kf6</filename>. The BLFS editors
+    recommend the latter in the BLFS environment.
+  </para>
+
+  <sect2>
+    <title>Installing in /usr</title>
+
+    <para>
+      One option is to install <application>KDE Frameworks</application>
+      into the <filename class="directory">/usr</filename> hierarchy.
+      This creates a simpler setup but makes it more difficult to try
+      multiple versions of <application>KDE Frameworks</application>.
+    </para>
+
+<screen><userinput>export KF6_PREFIX=/usr</userinput></screen>
+
+    <para>
+      It is a good idea to add the following variables to your
+      system or personal profiles:
+    </para>
+
+<screen role="root"><userinput>cat &gt;&gt; /etc/profile.d/qt6.sh &lt;&lt; "EOF"
+<literal># 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 $QT6DIR/lib/qml         QML2_IMPORT_PATH
+
+# End extension for /etc/profile.d/qt6.sh</literal>
+EOF
+
+cat &gt; /etc/profile.d/kf6.sh &lt;&lt; "EOF"
+<literal># Begin /etc/profile.d/kf6.sh
+
+export KF6_PREFIX=/usr
+
+# End /etc/profile.d/kf6.sh</literal>
+EOF</userinput></screen>
+
+    <note>
+      <para>
+        If <application>qt6</application> was installed in <filename
+        class="directory">/usr</filename>, the <filename
+        class="directory">$QT6DIR/lib/</filename> portions of the above paths
+        may need to be changed to <filename
+        class="directory">$QT6DIR/lib/qt6/</filename>.
+      </para>
+    </note>
+
+    <para>
+      Additionally, if <xref linkend="sudo"/> is installed, these variables
+      should be available to the super user. Execute the following commands as
+      the <systemitem class="username">root</systemitem> user:
+    </para>
+
+<screen role="root"><userinput>cat &gt;&gt; /etc/sudoers.d/qt &lt;&lt; "EOF"
+<literal>Defaults env_keep += QT_PLUGIN_PATH
+Defaults env_keep += QML2_IMPORT_PATH</literal>
+EOF
+
+cat &gt;&gt; /etc/sudoers.d/kde &lt;&lt; "EOF"
+<literal>Defaults env_keep += KF6_PREFIX</literal>
+EOF</userinput></screen>
+
+  </sect2>
+
+  <sect2>
+    <title>Installing in /opt</title>
+
+    <para>
+      A method of building multiple versions installs
+      <application>KDE Frameworks</application> in the
+      <filename class="directory">/opt</filename> hierarchy:
+    </para>
+
+<screen><userinput>export KF6_PREFIX=/opt/kf6</userinput></screen>
+
+    <para>
+      If you are not installing <application>KDE Frameworks</application>
+      in <filename class="directory">/usr</filename>, you will need to
+      make some additional configuration changes. Best practice is to add
+      those to your system or personal profile:
+    </para>
+
+<screen role="root"><userinput>cat &gt; /etc/profile.d/kf6.sh &lt;&lt; "EOF"
+<literal># 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/include          CPLUS_INCLUDE_PATH
+# End /etc/profile.d/kf6.sh</literal>
+EOF
+
+cat &gt;&gt; /etc/profile.d/qt6.sh &lt;&lt; "EOF"
+<literal># 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</literal>
+EOF</userinput></screen>
+
+    <para>
+      Expand your <filename>/etc/ld.so.conf</filename> file:
+    </para>
+
+<screen role="root"><userinput>cat &gt;&gt; /etc/ld.so.conf &lt;&lt; "EOF"
+<literal># Begin KF6 addition
+
+/opt/kf6/lib
+
+# End KF6 addition</literal>
+EOF</userinput></screen>
+
+    <indexterm zone="kf6-intro">
+      <primary sortas="e-etc-ld.so.conf">/etc/ld.so.conf</primary>
+    </indexterm>
+
+    <para revision="sysv">
+      Several <application>KDE Frameworks</application> and
+      <application>Plasma</application> packages install
+      files into <application>D-Bus</application> and
+      <application>Polkit</application> directories. When installing
+      <application>KDE Frameworks</application> in a location other than
+      <filename class="directory">/usr</filename>,
+      <application>D-Bus</application> and <application>Polkit</application>
+      need to be able to find these files.
+      The easiest way to achieve this is to create the following symlinks (as
+      the <systemitem class="username">root</systemitem> user):
+    </para>
+
+<screen role="root"
+        revision="sysv"><userinput>install -v -dm755           $KF6_PREFIX/{etc,share} &amp;&amp;
+ln -sfv /etc/dbus-1         $KF6_PREFIX/etc         &amp;&amp;
+ln -sfv /usr/share/dbus-1   $KF6_PREFIX/share       &amp;&amp;
+ln -sfv /usr/share/polkit-1 $KF6_PREFIX/share</userinput></screen>
+
+    <para revision="systemd">
+      Several <application>KDE Frameworks</application> and
+      <application>KDE Plasma</application> packages install
+      files into <application>D-Bus</application>,
+      <application>Polkit</application>, and
+      <application>systemd</application> directories. When installing
+      <application>KDE 6</application> in a location other than
+      <filename class="directory">/usr</filename>,
+      <application>D-Bus</application>, <application>Polkit</application>,
+      and <application>systemd</application>
+      need to be able to find these files.
+      The easiest way to achieve this is to create the following symlinks (as
+      the <systemitem class="username">root</systemitem> user):
+    </para>
+
+<screen role="root"
+        revision="systemd"><userinput>install -v -dm755           $KF6_PREFIX/{etc,share} &amp;&amp;
+ln -sfv /etc/dbus-1         $KF6_PREFIX/etc         &amp;&amp;
+ln -sfv /usr/share/dbus-1   $KF6_PREFIX/share       &amp;&amp;
+ln -sfv /usr/share/polkit-1 $KF6_PREFIX/share       &amp;&amp;
+install -v -dm755           $KF6_PREFIX/lib         &amp;&amp;
+ln -sfv /usr/lib/systemd    $KF6_PREFIX/lib</userinput></screen>
+
+    <para>
+      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 <filename class="directory">/usr/share</filename>
+      to avoid having multiple installations of <xref linkend="hicolor-icon-theme"/>.
+      Run the following commands as the <systemitem class="username">root</systemitem>
+      user:
+    </para>
+
+<screen role="root"><userinput>install -v -dm755                $KF6_PREFIX/share/icons &amp;&amp;
+ln -sfv /usr/share/icons/hicolor $KF6_PREFIX/share/icons</userinput></screen>
+
+    <tip>
+      <para>
+        Sometimes, the installation paths are hardcoded into installed files.
+        This is the reason why <filename class="directory">/opt/kf6</filename>
+        is used as installation prefix instead of <filename
+        class="directory">/opt/kf6-&kf6-version;</filename>. After installing
+        <application>KDE Frameworks</application>, you may rename the directory
+        and create a symlink:
+      </para>
+
+<screen role="root"><userinput>mv /opt/kf6{,-&kf6-version;}
+ln -sfv kf6-&kf6-version; /opt/kf6</userinput></screen>
+
+      <para>
+        Later on, you may want to install other versions of
+        <application>KDE Frameworks</application>. To do that, just remove
+        the symlink and use <filename class="directory">/opt/kf6</filename>
+        as the prefix again. Which version of
+        <application>KDE Frameworks</application> you use depends only on
+        where the symlink points. No other reconfiguration will be needed.
+      </para>
+    </tip>
+
+  </sect2>
+
+</sect1>
