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
