bootstrap fail on powerpc-apple-darwin8

[IainS]

uname -prs
Darwin 8.11.0 powerpc

Updating SVN tree
At revision 151374.

config:
  ../gcc-4-5-regtest/configure --prefix=/Volumes/ScratchCS/gcc-4-5- 
install --target=powerpc-apple-darwin8 --host=powerpc-apple-darwin8 -- 
build=powerpc-apple-darwin8 --enable-languages=c,objc,c++,obj-c+ 
+,fortran --enable-version-specific-runtime-libs --enable-threads -- 
enable-checking=yes --program-suffix=-4.5.0 --with-dwarf2 --with- 
libiconv-prefix=/usr --with-system-zlib --enable-stage1-languages=c,c++

output:

[address=03d770b0 pc=002cabf8]
../../gcc-4-5-regtest/gcc/config/rs6000/altivec.md: In function  
'recog_48':
../../gcc-4-5-regtest/gcc/config/rs6000/altivec.md:1864:1: internal  
compiler error: Segmentation Fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
make[3]: *** [insn-recog.o] Error 1
make[2]: *** [all-stage2-gcc] Error 2
make[1]: *** [stage2-bubble] Error 2
make: *** [bootstrap] Error 2

what other output would hep diagnose this?
(151057 was my last successful bootstrap)
Iain