[PhillyOnRails] RPM update disappears gems

[Cassius Rosenthal <cassius@xmodulation.com>]

I ran into a terrible problem with one of my Rails stacks this past 
weekend.  This probably only affects RPM-based Linux distributions, 
perhaps only Fedora.  I've posted in Fedora blogs, but since this isn't 
a Rails bug per se, many of you using Linux may not hear about it elsewhere.

The box in question: FedoraCore 5 on an AMD x86_64.  I updated my OS 
using `yum update` and on reboot it appeared as though all of my gems 
had disappeared, rendering all of my Rails apps useless until I 
reinstalled all gems.  Fortunately for me, this was on a workstation.  
Obviously this could have been *really* bad on a live server.

The problem: ruby lived in /usr/lib64/ruby.  As is common, 32-bit 
libraries are kept in parallel directories for my Linux x86_64 install.  
For reasons that I don't understand, the yum update switched to the 
32-bit libraries, so now ruby lives in /usr/lib/ruby.  I had to 
reinstall all gems so that they could be found in the library path.

If anyone has any similar experiences, I'd like to know.  This was a 
very unpleasant surprise.

And on another subject, installing RMagick is a terrible experience on 
Fedora Core 5, 6, and CentOS.

(^_^)

Thanks!
-Cassius
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