systemd: use a better way to disable /usr/lib/pam.d

chapter08/systemd.xml

@@ -65,6 +65,7 @@ meson --prefix=/usr                 \
       -Duserdb=false                \
       -Dman=false                   \
       -Dmode=release                \
+      -Dpamconfdir=no               \
       -Ddocdir=/usr/share/doc/systemd-&systemd-version; \
       ..</userinput></screen>
 
@@ -159,6 +160,13 @@ meson --prefix=/usr                 \
         </listitem>
       </varlistentry>
 
+      <varlistentry>
+        <term><parameter>-Dpamconfdir=no</parameter></term>
+        <listitem>
+          <para>Prevent the installation of a PAM configuration file not
+          functional on LFS.</para>
+        </listitem>
+      </varlistentry>
     </variablelist>
 
     <para>Compile the package:</para>
@@ -175,10 +183,6 @@ meson --prefix=/usr                 \
          component in the path.  -->
 <screen><userinput remap="install">tar -xf ../../systemd-man-pages-&systemd-man-version;.tar.xz --strip-components=1 -C /usr/share/man</userinput></screen>
 
-    <para>Remove a useless directory:</para>
-
-<screen><userinput remap="install">rm -rf /usr/lib/pam.d</userinput></screen>
-
     <para>Create the <filename>/etc/machine-id</filename> file needed by
     <command>systemd-journald</command>:</para>