Error: bad register name `%rbx'

I try compile SVN reversion 30000 under mingw. Newest SVN version
works for me but i want 30k reversion.
I have this error:

gcc -Wundef -Wdisabled-optimization -Wno-pointer-sign -Wdeclaration-after-statem
ent -std=gnu99 -Wall -Wno-switch -Wpointer-arith -Wredundant-decls -O4 -march=i4
86 -mtune=generic -pipe -ffast-math -fomit-frame-pointer -D_LARGEFILE_SOURCE -D_
FILE_OFFSET_BITS=64 -I.   -I/mingw/include -Ii:/mingw/include/bs2b     -c -o cpu
detect.o cpudetect.c
{standard input}: Assembler messages:
{standard input}:98: Error: bad register name `%rbx'
{standard input}:100: Error: bad register name `%rbx'
(...)

How to fix it?