Re: Multiple versions

[Pjotr Prins]

Hi Dmitry,

On Sat, Dec 26, 2015 at 11:02:52PM +0000, Dmitry Bogatov wrote:
> Hello!
> 
> In my attempt to understand Guix, get used to it and use
> it's advantages, I got following considerations that I would like
> to discuss with more experienced users:
> 
>   * Guix provides first-class support for multiple versions of packages.
>     By first class I mean, that you don't need to do anything special
>     to get this support, unlike Gentoo, which for example, supports
>     multiple versions of Python and Ruby, but not Guile or GHC.
> 
>     But reading 'gnu/packages/haskell.scm' I see same, single-versioned
>     packaging in style of Debian. Why? If we would provide package for
>     every version of library 'foo' and every version of 'ghc', Guix
>     would replace `haskell-stack' tool, and, eventually became The Ring
>     to rule stack,virtualenv,bundler,...
> 
>     Or am I missing the point, and libraries are packaged only as long
>     they are needed for some program?

You can mix versions. Maybe this helps

  https://github.com/pjotrp/guix-notes/blob/master/REPRODUCIBLE.org