gdk-pixbuf, pango:

Add --wrap-mode=no-fallback to prevent gi-docgen getting downloaded
if you have the (python3) deps present. Comment gtk-doc in these
packages, explain that gi-docgen is used for the documentation.

introduction/welcome/changelog.xml

@@ -44,6 +44,10 @@
     <listitem>
       <para>August 26th, 2021</para>
       <itemizedlist>
+        <listitem>
+          <para>[ken] - Add --wrap-mode=nofallback to gdk-pixbuf and pango. Fixes
+          <ulink url="&blfs-ticket-root;15466">#15466</ulink>.</para>
+        </listitem>
         <listitem>
           <para>[ken] - Update to Unicode-Collate-1.31 (perl module). Fixes
           <ulink url="&blfs-ticket-root;15446">#15446</ulink>.</para>

x/lib/gdk-pixbuf.xml

@@ -100,8 +100,9 @@
     <bridgehead renderas="sect4">Optional</bridgehead>
     <para role="optional">
        <!--<xref linkend="jasper"/> and-->
-      <xref linkend="gtk-doc"/> and
+  <!--<xref linkend="gtk-doc"/> and-->
       <ulink url="https://gitlab.gnome.org/ebassi/gi-docgen">gi-docgen</ulink>
+      (to generate documentation)
     </para>
 
     <para condition="html" role="usernotes">
@@ -120,7 +121,7 @@
 <screen><userinput>mkdir build &amp;&amp;
 cd build &amp;&amp;
 
-meson --prefix=/usr --buildtype=release -Dgtk_doc=false .. &amp;&amp;
+meson --prefix=/usr --buildtype=release --wrap-mode=nofallback .. &amp;&amp;
 ninja</userinput></screen>
 
     <para>
@@ -152,12 +153,17 @@ ninja</userinput></screen>
     <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
       href="../../xincludes/meson-buildtype-release.xml"/>
 
+    <!-- gi-docgen can get installed without this, if deps exist -->
+    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+      href="../../xincludes/meson-wrap-nofallback.xml"/>
+
+    <!-- gtk_doc replaced by gi-docgen
     <para>
       <option>-Dgtk_doc=true</option>: Use this parameter if
       <application>GTK-Doc</application> is installed and you wish to rebuild
       and install the API documentation.
-      <!-- -Dgtk_doc is set to "yield=true" in meson_options.txt -->
-    </para>
+      <!\-\- -Dgtk_doc is set to "yield=true" in meson_options.txt \-\->
+    </para>-->
 <!-- Removed in 2.42.0
     <para>
       <option>-Djasper=true</option>: If you've installed

x/lib/pango.xml

@@ -93,9 +93,10 @@
     <bridgehead renderas="sect4">Optional</bridgehead>
     <para role="optional">
       <xref linkend="cantarell-fonts"/> (for tests),
-      <xref linkend="gtk-doc"/>,
+  <!--<xref linkend="gtk-doc"/>,-->
       <xref linkend="sysprof"/>,
-      <ulink url="https://gitlab.gnome.org/GNOME/gi-docgen">gi-docgen</ulink>,
+      <ulink url="https://gitlab.gnome.org/GNOME/gi-docgen">gi-docgen</ulink>
+      (to generate documentation),
       <ulink url="https://ftpmirror.gnu.org/gnu/help2man">help2man</ulink>, and
       <ulink url="https://linux.thai.net/projects/libthai">libthai</ulink>
     </para>
@@ -116,7 +117,7 @@
 <screen><userinput>mkdir build &amp;&amp;
 cd    build &amp;&amp;
 
-meson --prefix=/usr --buildtype=release .. &amp;&amp;
+meson --prefix=/usr --buildtype=release --wrap-mode=nofallback .. &amp;&amp;
 ninja</userinput></screen>
 
     <para>
@@ -151,20 +152,21 @@ install -vm 644 ../utils/pango-view.1.in /usr/share/man/man1/pango-view.1</useri
     <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
       href="../../xincludes/meson-buildtype-release.xml"/>
 
+    <!-- gtk-doc replaced by gi-docgen
     <para>
       <option>-Dgtk_doc</option>: Use this switch if gtk-doc is 
       installed and you wish to rebuild and install the API documentation.
-    </para>
+    </para>-->
 
     <para>
       <option>-Dintrospection=false</option>: Use this switch if you do not
       want to use <xref linkend="gobject-introspection"/>.
     </para>
 
-    <!-- gi-docgen is now included in the tarball with 1.48.4
+    <!-- gi-docgen can get installed without this, if deps exist -->
     <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
-      href="../../xincludes/meson-wrap-nodownload.xml"/>
-    -->
+      href="../../xincludes/meson-wrap-nofallback.xml"/>
+
   </sect2>
 
   <sect2 role="configuration">

xincludes/meson-wrap-nofallback.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="ISO-8859-1"?>
+<!DOCTYPE note PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
+  "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" >
+
+
+    <para>
+      <parameter>--wrap-mode=nofallback</parameter>: This switch prevents
+      <command>meson</command> from iusing subproject fallbacks for any
+      dependency declarations in the build files, stopping it downloading
+      any optional dependency which is not installed on the system.
+    </para>