I'm trying to build SVN head on an openSUSE 11.0 AMD64 system.
configure and make run fine until I hit the following problem:

./miniruby -I./lib -I.ext/common -I./- -r./ext/purelib.rb  -I.
-rrbconfig ./tool/compile_prelude.rb ./prelude.rb ./enc/prelude.rb
./gem_prelude.rb prelude.c
/home/cs/tmp/ruby/rbconfig.rb:173: [BUG] Stack consistency error (sp:
36, bp: 34)
ruby 1.9.0 (2008-07-25 revision 18120) [x86_64-linux]

-- control frame ----------
c:0013 p:0158 s:0036 b:0034 l:000022 d:000033 BLOCK
/home/cs/tmp/ruby/rbconfig.rb:173
c:0012 p:---- s:0029 b:0029 l:000028 d:000028 FINISH
c:0011 p:---- s:0027 b:0027 l:000026 d:000026 CFUNC  :gsub!
c:0010 p:0019 s:0023 b:0023 l:000022 d:000022 METHOD
/home/cs/tmp/ruby/rbconfig.rb:169
c:0009 p:0016 s:0018 b:0018 l:000011 d:000017 BLOCK
/home/cs/tmp/ruby/rbconfig.rb:187
c:0008 p:---- s:0017 b:0017 l:000016 d:000016 FINISH :singleton_method_added
c:0007 p:---- s:0015 b:0015 l:000014 d:000014 CFUNC  :each_value
c:0006 p:2943 s:0012 b:0012 l:000011 d:000011 CLASS
/home/cs/tmp/ruby/rbconfig.rb:186
c:0005 p:0007 s:0010 b:0010 l:000009 d:000009 TOP
/home/cs/tmp/ruby/rbconfig.rb:5
c:0004 p:---- s:0008 b:0008 l:000007 d:000007 FINISH :set_encoding
c:0003 p:---- s:0006 b:0006 l:000005 d:000005 CFUNC  :require
c:0002 p:-1116694 s:0004 b:0004 l:000003 d:000003 TOP
c:0001 p:0000 s:0002 b:0002 l:000001 d:000001 TOP
---------------------------
DBG> : "/home/cs/tmp/ruby/rbconfig.rb:173:in `block in expand'"
DBG> : "/home/cs/tmp/ruby/rbconfig.rb:169:in `gsub!'"
DBG> : "/home/cs/tmp/ruby/rbconfig.rb:169:in `expand'"
DBG> : "/home/cs/tmp/ruby/rbconfig.rb:187:in `block (1 levels) in
<module:RbConfig>'"
DBG> : "/home/cs/tmp/ruby/rbconfig.rb:186:in `each_value'"
DBG> : "/home/cs/tmp/ruby/rbconfig.rb:186:in `<module:RbConfig>'"
DBG> : "/home/cs/tmp/ruby/rbconfig.rb:5:in `<top (required)>'"
DBG> : ":0:in `require'"
-- backtrace of native function call (Use addr2line) --
0x504adf
0x43c21e
0x43c361
0x4fe1e3
0x4fe7f6
0x50266c
0x4d05ef
0x4f8386
0x4fa68b
0x4fe7f6
0x50266c
0x44e882
0x44f0a3
0x4bf86b
0x450bf8
0x43dcdb
0x4500c2
0x45054c
0x4f8386
0x4fa68b
0x4fe7f6
0x4fe9d1
0x4407f5
0x4413ff
0x4f5296
0x4f56d8
0x4f7f5f
0x4b7fb5
0x4b9574
0x4b9d7d
0x4f172b
0x4b8364
0x43f6b8
0x417c05
0x2b17596b9436
0x417af9
-------------------------------------------------------
make: *** [prelude.c] Aborted

Any idea how to resolve this?

Thanks,
Chris