xorg-server: List dbus as recommended

x/installing/xorg-server.xml

@@ -100,8 +100,10 @@
 
     <bridgehead renderas="sect4">Recommended</bridgehead>
     <para role="recommended">
-      <phrase revision="sysv"><xref role="runtime"
-                                    linkend="elogind"/> (runtime),</phrase>
+      <phrase revision="sysv"><xref linkend='dbus'/>,
+      <xref role="runtime" linkend="elogind"/> (runtime;
+      <systemitem class='library'>libelogind</systemitem> also referred
+      at build time but it's not really useful),</phrase>
       <xref linkend="libepoxy"/> (needed for glamor),
       <xref linkend="libtirpc"/>,
       <phrase revision="systemd"><xref role="runtime"
@@ -109,6 +111,26 @@
       and <xref role='runtime' linkend='xorg-libinput-driver'/> (runtime)
     </para>
 
+    <!-- TODO: Add -Dsystemd_logind=yes explicitly (like -Dglamor=true) to
+         make this more clear for BLFS 12.2.  Now (Feb 16 2024) this package
+         is already under 12.1 freeze. -->
+    <note>
+      <para>
+        Although it's possible to<phrase revision='sysv'> build this package
+        without <xref linkend='dbus'/> installed or</phrase> run the Xorg
+        server without
+        <phrase revision='sysv'><xref linkend='elogind'/></phrase><phrase
+        revision='systemd'><xref linkend='systemd'/>
+        (rebuilt with PAM)</phrase> functioning, it would require running
+        the Xorg server as the &root; user or Xorg server will malfunction
+        or even fail to start.  The BLFS editors strongly discourage
+        skipping <phrase revision='sysv'>these two
+        dependencies</phrase><phrase revision='systemd'>this
+        dependency</phrase>.  Do not attempt to do so unless you really know
+        what you are doing.
+      </para>
+    </note>
+
     <bridgehead renderas="sect4">Optional</bridgehead>
     <para role="optional">
       <xref role="runtime" linkend="acpid"/> (runtime),
@@ -264,7 +286,7 @@ mkdir -pv /etc/X11/xorg.conf.d</userinput></screen>
       <option>-Dsuid_wrapper=true</option>: Builds the suid-root
       wrapper for legacy DDX driver support on rootless xserver systems.
     </para>
-
+<!-- commented out because this option defaults to auto
     <para>
       <option>-Dsystemd_logind=false</option>:
       This switch disables <phrase revision="systemd">systemd-logind</phrase>
@@ -272,7 +294,7 @@ mkdir -pv /etc/X11/xorg.conf.d</userinput></screen>
       to work without having the <phrase revision="systemd">systemd</phrase>
       <phrase revision="elogind">elogind</phrase> PAM module configured.
     </para>
-
+-->
     <para revision="sysv">
       <command>cat &gt;&gt; /etc/sysconfig/createfiles...</command>: This
       command creates the <filename class="directory">/tmp/.ICE-unix</filename>