32 bit ruby versus 64 bit gem ELF issues

I am running into what I thought should be a simple solution…however
not the case yet.

I am running on Suse 64 bit:
Linux #1 SMP PREEMPT 2010-03-16 21:25:39 +0100
x86_64 x86_64 x86_64 GNU/Linux

My version of ruby is 32 bit version 1.8.7. I normally run a Lightty
front end with two instances of mongrel behind it. When I go to run the
gem install for mongrel 1.1.5 it builds fine, however, it builds as a 64
bit lib for http11.so. This causes ELF64 issues when I attempt to run
the rails (2.3.5) app.

Is there a way to have a gem compile as 32 bit when doing the install? I
could not find a command-line switch etc.

For now the plan has been to remain all 32-bit versus getting everything
to 64-bit…maybe that is not solid thinking.

Any information is appreciated…