Doesn't this answer the question:

https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Build_Instructions/Simple_Firefox_build

"Though you can build Firefox to run on 32-bit machines, the build process for 
almost all of our products requires a 64-bit OS."

You mention a 'full' 64bits OS - does that mean you have some sort of 64-bit 
system installed?

I build 32 bit versions in a chroot in a 64-bit OS. This might not be directly 
related to your issue, but you might see something helpful:

http://ray-v.tk/building-firefox-seamonkey-thunderbird-releases-using-mercurial-sources.html

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