Hi, I don't know if this has been noticed before, but it appears that the
incompatible changes to sys/ucontext.h for the PowerPC have been fixed in
GLIBC HEAD (.../powerpc/sys/ucontext.h revision 1.9, from 09/2003); this
makes the GLIBC23._STYLE_UCONTEXT conditionals on ppc-linux-os.c
unnecessary (at least when compiling with Debian's libc6-2.3.2.ds1-10,
which included that change on 11/2003).