Usermodelinux for ppc

[Saladino]

Hi,
After trying qemu I am now trying uml. I cannot compile it because it
searches the subarch as powerpc and the Makefile that exists is
Makefile-ppc, not Makefile-powerpc.
May I have troubles if I do SUBARCH=ppc ?
I am doing something wrong?
Thanks for your time.
Saladino