And for those of us who've recently upgraded to OSX 10.5 and are getting errors similar to the following:

ld: symbol(s) not found for architecture ppc
collect2: ld returned 1 exit status
lipo: can't open input file: /var/folders/yO/yOnTsq9GEayvBZtIrvcjME+++
+TI/-Tmp-//ccanCD8S.out (No such file or directory)
make: *** [miniparrot] Error 1
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Then setting the following should allow a successful compilation:

export ARCHFLAGS=-arch i386
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I suspect that this may only apply if you're using the Apple-supplied /usr/bin/perl as I don't recall having to do this with my previous compiled-from-source one.