Moving from 32-bit to 64-bit Fedora

[Geoffrey Leach]

I'm currently running a 32-bit Fedora 16 on a 64-bit capable system. I 
intend to upgrade to a 64-bin install for Fedora 17.

My way of moving between releases is to install (from DVD), 
reformatting / and /boot, leaving /home and /usr/local (which have 
their own partitions) untouched.

My question is what steps do I need to take to ensure that the 
necessary 32-bit libraries that I'll need to the stuff I have built 
locally get installed, or would it be better to just recompile 
everything?

Thoughts?