Patching file src/fe-common/silc/fe-silcnet.c using Plan A...
Hunk #1 succeeded at 31.
Hmm...  The next patch looks like a unified diff to me...
The text leading up to this was:
--------------------------
|--- irssi/src/fe-common/silc/module.h.orig	2004-03-19 18:34:19.000000000 +0100
|+++ irssi/src/fe-common/silc/module.h	2004-03-19 18:34:27.000000000 +0100
--------------------------
Patching file src/fe-common/silc/module.h using Plan A...
Hunk #1 succeeded at 1.
done
touch /home/ilf/irssi-0.8.10/irssi.cvs
( cd /home/ilf/irssi-0.8.10 ; NOCONFIGURE=y ./autogen.sh )
Creating help files...
svn: not found
**Warning**: svn not found, skipping ChangeLog updating. The reported irssi version may be incorrect.
Documentation: html -> txt...
Checking auto* tools...
**Warning**: I am going to run `configure' with no arguments.
If you wish to pass any to it, please specify them on the
`./autogen.sh' command line.

Running libtoolize...
You should add the contents of `/usr/local/share/aclocal/libtool.m4' to `aclocal.m4'.
Running aclocal  -I . ...
cp: glib.m4_: No such file or directory
configure.in:346: warning: underquoted definition of AC_CHECK_GLIBDIR
  run info '(automake)Extending aclocal'
  or see http://sources.redhat.com/automake/automake.html#Extending-aclocal
curses.m4:89: warning: underquoted definition of AC_CHECK_CURSES
curses.m4:145: warning: underquoted definition of AC_USE_SUNOS_CURSES
curses.m4:159: warning: underquoted definition of AC_USE_OSF1_CURSES
curses.m4:170: warning: underquoted definition of AC_USE_SYSV_CURSES
curses.m4:205: warning: underquoted definition of AC_NCURSES
curses.m4:232: warning: underquoted definition of AC_SEARCH_NCURSES
/usr/local/gnu-autotools/share/aclocal-1.9/glib.m4:8: warning: underquoted definition of AM_PATH_GLIB
/usr/local/gnu-autotools/share/aclocal/glib.m4:8: warning: underquoted definition of AM_PATH_GLIB
configure.in:18: warning: AC_ARG_PROGRAM invoked multiple times
cp: glib-2.0.m4_: No such file or directory
configure.in:346: warning: underquoted definition of AC_CHECK_GLIBDIR
  run info '(automake)Extending aclocal'
  or see http://sources.redhat.com/automake/automake.html#Extending-aclocal
curses.m4:89: warning: underquoted definition of AC_CHECK_CURSES
curses.m4:145: warning: underquoted definition of AC_USE_SUNOS_CURSES
curses.m4:159: warning: underquoted definition of AC_USE_OSF1_CURSES
curses.m4:170: warning: underquoted definition of AC_USE_SYSV_CURSES
curses.m4:205: warning: underquoted definition of AC_NCURSES
curses.m4:232: warning: underquoted definition of AC_SEARCH_NCURSES
/usr/local/gnu-autotools/share/aclocal-1.9/glib.m4:8: warning: underquoted definition of AM_PATH_GLIB
/usr/local/gnu-autotools/share/aclocal/glib.m4:8: warning: underquoted definition of AM_PATH_GLIB
configure.in:18: warning: AC_ARG_PROGRAM invoked multiple times
Running autoheader...
autoheader: WARNING: Using auxiliary files such as `acconfig.h', `config.h.bot'
autoheader: WARNING: and `config.h.top', to define templates for `config.h.in'
autoheader: WARNING: is deprecated and discouraged.
autoheader: 
autoheader: WARNING: Using the third argument of `AC_DEFINE' and
autoheader: WARNING: `AC_DEFINE_UNQUOTED' allows to define a template without
autoheader: WARNING: `acconfig.h':
autoheader: 
autoheader: WARNING:   AC_DEFINE([NEED_FUNC_MAIN], 1,
autoheader: 		[Define if a function `main' is needed.])
autoheader: 
autoheader: WARNING: More sophisticated templates can also be produced, see the
autoheader: WARNING: documentation.
configure.in:18: warning: AC_ARG_PROGRAM invoked multiple times
Running autoconf ...
configure.in:18: warning: AC_ARG_PROGRAM invoked multiple times
Running automake --gnu  ...
configure.in:18: warning: AC_ARG_PROGRAM invoked multiple times
src/core/Makefile.am: installing `./depcomp'
Skipping configure process.
#
#

You can now configure and compile your Irssi source tree