Compilation Error (soft synth related?)

[speakup@xxxxxxxxxxxxxxxxxx (luke)]

While compiling kernel version 2.6.24.7, from a speakup tree acquired on 
Thursday morning from the git mirror, I get this a while after the make 
bzImage.  Interestingly, I didn't get this when compiling a 2.6.18 kernel 
with the same speakup tree, and different kernel options.

  CC      drivers/char/speakup/speakup_soft.o
  CC      drivers/char/speakup/buffers.o
  CC      drivers/char/speakup/devsynth.o
drivers/char/speakup/devsynth.c: In function ?
speakup_file_write?
:
drivers/char/speakup/devsynth.c:27: error: implicit declaration of 
function ?
copy_from_user?

make[3]: *** [drivers/char/speakup/devsynth.o] Error 1
make[2]: *** [drivers/char/speakup] Error 2
make[1]: *** [drivers/char] Error 2
make: *** [drivers] Error 2

Any thoughts?

Regards,

Luke