Documentation bug
Section: docs/manual/libsigc_manual.xml
<programlisting>g++ example1.cc -o eg1 `pkg-config --cflags --libs
sigc++-1.2`</programlisting>

and later

<para>See the reference documentation <ulink
url="http://libsigc.sourceforge.net/libsigc1_2/reference/">online</ulink></para>

Correct version:
<programlisting>g++ example1.cc -o eg1 `pkg-config --cflags --libs
sigc++-2.0`</programlisting>

and

<para>See the reference documentation <ulink
url="http://libsigc.sourceforge.net/libsigc2/docs/index.html">online</ulink></para>

respectively.

Other information:
Here's a cut'n'pastable patch:

--- libsigc_manual.xml~ 2005-01-11 13:11:23.000000000 +0000
+++ libsigc_manual.xml  2005-07-13 13:15:06.000000000 +0100
@@ -127,7 +127,7 @@
        <literal remap="tt">warn_people()</literal> function to a slot using the
<literal remap="tt">slot()</literal> function.</para>

        <para>To compile this example from the downloadable example code,
use:</para>
-       <programlisting>g++ example1.cc -o eg1 `pkg-config --cflags --libs
sigc++-1.2`</programlisting>
+       <programlisting>g++ example1.cc -o eg1 `pkg-config --cflags --libs
sigc++-2.0`</programlisting>
        <para>Note that those `` characters are backticks, not single quotes.
Run it with</para>
        <programlisting>./eg1</programlisting>
        <para>(Try not to panic when the aliens land!)</para>
@@ -484,6 +484,6 @@

 <chapter id="sec-reference">
 <title>Reference</title>
-       <para>See the reference documentation <ulink
url="http://libsigc.sourceforge.net/libsigc1_2/reference/">online</ulink></para>
+<para>See the reference documentation <ulink
url="http://libsigc.sourceforge.net/libsigc2/docs/index.html">online</ulink></para>
 </chapter>
 </book>