Build 32 bit Qt on 64 bit system

[pseudosig]

Has anyone tried building a 32 bit Qt on a 64 bit system? I've looked around the net for some help on this and haven't found much. Basically, I set QMAKESPEC=linux-g++-32 and ./configure runs fine with the -m32 option. But when I do a "make", it barfs a few minutes into the make with an assembler message.

In file included from ../../include/QtCore/qdir.h:25,
                 from global/qlibraryinfo.cpp:22:
../../include/QtCore/qstring.h:462:44: warning: this is the location of the previous definition
{standard input}: Assembler messages:
{standard input}:1104: Error: suffix or operands invalid for `cmpxchg'

In file included from ../../include/QtCore/qdir.h:25,
                 from global/qlibraryinfo.cpp:22:
../../include/QtCore/qstring.h:462:44: warning: this is the location of the previous definition
{standard input}: Assembler messages:
{standard input}:1104: Error: suffix or operands invalid for `cmpxchg'

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I'm trying to build Qt 4.3.5