Compiling x86 rpms on x86_64

[Mark]

I am finding some interesting problems trying to rebuild mozilla-1.6-0.i386 on 
my x86_64 system. It seems that even if I tell it "rpmbuild -ba --target=i386 
mozilla.spec",  it still builds the 64Bit version. What am I missing?

I have already specifically set ${_libdir) to /usr/lib.

regards,
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