> >> I do the same with Ruby using profiles. I have any number of interpreters
> >> installed for testing and any number of libraries using either guix or
> >> the lib path with a profile in there.
> >
> > But how do you solve problem, that for example you want library foo-999.very.new,
> > compiled with ruby-1.8, but they never existed at same time in guix
> > package tree?
> 
> Then you can either look up the recipe for ruby-1.8 in the repository
> history and copy it, or you create a fresh variant of the “ruby” package
> with something like this:
> 
>     (define-public my-particular-ruby
>       (package (inherit ruby)
>         (version "1.8")
>         (source (origin ...) ...)))
> 
> Here you adjust the version and the source, and bind this variant to a
> name “my-particular-ruby”.
> 
> You can either put this expression in the “ruby.scm” module (e.g. in a
> local branch), or maintain your own package module.  If you choose the
> latter you’d have to tell Guix about it by pointing the environment
> variable “GUIX_PACKAGE_PATH” at the path.

Looks not so easy, but I got my answers. Thanks.

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