compiler error: reload_cse_simplifty_operands

Hi all,

I am trying to compile matplotlib under MacOSX 10.5, and I get the
following error message:

src/_image.cpp:842: error: insn does not satisfy its constraints:
(insn 2573 1070 2574 126 agg24/include/agg_color_rgba.h:268 (set
(mem:QI (plus:SI (reg/f:SI 6 bp)
                (const_int -280 [0xfffffffffffffee8])) [0 SR.2990+0 S1 A8])
        (reg:QI 5 di)) 56 {*movqi_1} (nil)
src/_image.cpp:842: internal compiler error: in
reload_cse_simplify_operands, at postreload.c:391

Has anyone seen this before? I have found the following link, but no
solution is indicated:

Is this a compiler bug, or are there flags I can use to fix the
problem? I'd appreciate any advice.