build error - missing linux/ltt-facilities.h

Hello,

	I'm trying to build kernel 2.6.23.1 using 
patch-2.6.23.1-lttng-0.10-pre7-port.tar.bz2

Make exits with the error:

ltt/probes/ltt-probe-stack_arch_x86_64.c:15:34: linux/ltt-facilities.h: 
No such file or directory

I grep'd through the patches and only found reference to the #include.

Is there a recommended kernel / patch combination?

I tried the patch-2.6.22.1-rt4.lttng-0.10.tar.gz, but had to manually 
fix linux/exit.c. It didn't have to ltt options in menuconfig. I'm 
guessing 'rt4' refers to some "real-time" patch?

Thanks for your help.

Andy