On 16 avr. 09, at 14:32, James Gray wrote:

> On Apr 16, 2009, at 12:52 PM, Juan Zanos wrote:
>
>> I'd like to start using Ruby 1.9 more often.  Often I could use  
>> the extra performance.  However, I'm still concerned about bugs  
>> and incompatibilities.   Is there a practical way to use 1.9 in  
>> such a way that these potential problems are minimized?  I mostly  
>> use Linux and OSX, and on rare occasions Windows.
>
> One easy way is just to install 1.9 separate from your 1.8  
> install.  You can do that by feeding the configure script a -- 
> program-suffix=19 option which would add a 19 to the end of all the  
> executables it installs.  Thus you would use ruby19, irb19, etc.
>
> Hope that helps.
>
> James Edward Gray II
>

I think that's a great way to keep ruby 1.9 separate from 1.8.   I'm  
still not sure how to manage various versions of 1.9 across various  
operating systems.