Downgrading glibc

I went through the gcc upgrade and discovered that ssp no
longer works  
(suppose it was documented somewhere - but I missed it)

So I'm trying to reverse the upgrade process (this time
using using a  
hardened profile) and glibc won't allow me to downgrade.

How do I get around this, please?

I've considered hacking the script/size/md5 tests, but
would prefer to do  
it the proper way.

TIA
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