Speakup with 2.6.18

[Tom Moore]

Hi guys,
I'm trying to build Xen and it uses kernel 2.6.18.
Which Cvs version should I checkout that is compatible with this kernel?
The errors that I'm getting are:
  CC      drivers/char/speakup/speakup.o
drivers/char/speakup/speakup.c:2677:39: error: macro "DECLARE_WORK" 
requires 3 arguments, but only 2 given
drivers/char/speakup/speakup.c:2677: warning: type defaults to â
intâ
 in declaration of â
DECLARE_WORKâ

drivers/char/speakup/speakup.c: In function â
speakup_helpâ
:
drivers/char/speakup/speakup.c:2686: error: â
ld_helpâ
 undeclared (first use
in this function)
drivers/char/speakup/speakup.c:2686: error: (Each undeclared identifier 
is reported only once
drivers/char/speakup/speakup.c:2686: error: for each function it appears 
in.)
make[3]: *** [drivers/char/speakup/speakup.o] Error 1
make[2]: *** [drivers/char/speakup] Error 2
make[1]: *** [drivers/char] Error 2
make: *** [drivers] Error 2

This is on a Debian 4.0 system with all updates installed.
Kernel I'm running with Speakup is 2.6.21.6.

Tom