Phillip,
this problem has already been solved: use RVM. Create a file called ".rvmrc" 
and put it into the root directory of your project, like this:

rvm use 1.9.2-p290

Whenever you switch into that project (in your terminal) RVM will automatically 
switch ruby versions.

To get your server to recognize  a different ruby version is a little 
different. 

Yea, I think with Passenger/Apache you can configure the PassengerRuby setting 
on your site to use the Ruby binary you specify. I don't think there's a way to 
configure it in the app itself. think about it, how would Ruby itself read the 
config file before determining which ruby binary to use? It's impossible--- 
catch 22, it has to be in the server's configuration

-Jason



On Jun 4, 2012, at 2:43 PM, Philip Rhoades wrote:

> People,
> 
> Most of my Rails apps are using Ruby v1.8.7 but I need to start using Ruby 
> v1.9.3 for one app in particular and to start learning Rails 3.2.  It seems 
> if I could install Ruby v1.9.3 side by side with v1.8.7 on my Fedora 16 
> x86_64 server, I should be able to have something like this:
> 
>  "RUBY_VERSION = 1.9.3"
> 
> in an app's config/environment.rb file and everything would "just work" ?
> 
> I have messed around with RVM in the past trying to get system-wide installs 
> to work with both Ruby versions but just got into trouble and was only ever 
> able to get one version of Ruby working at once with Apache.
> 
> Suggestions?
> 
> Thanks,
> 
> Phil.
> -- 
> Philip Rhoades
> 
> GPO Box 3411
> Sydney NSW    2001
> Australia
> E-mail:  p...@pricom.com.au
> 
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