FYI,

I've committed the attached.  I get the error:

In file included from /home/scratch/GDB/src/gdb/x86-64-tdep.c:30:
/home/scratch/GDB/src/gdb/x86-64-tdep.h:27: sys/reg.h: No such file or 
directory
gmake[1]: *** [x86-64-tdep.o] Error 1
gmake[1]: Leaving directory 
`/home/scratch/GDB/X-x86_64-unknown-linux-gnu/gdb'
gmake: *** [all-gdb] Error 2

when trying to build an x86_64-linux-gnu target.

enjoy,
Andrew