Re: installing different versions of the same module

[Amirouche]

Le 07/05/2017 à 12:55, Amirouche a écrit :
> Le 07/05/2017 à 05:08, Mike Gran a écrit :
> > On Saturday, May 6, 2017 2:00 PM, Tim Chadburn 
> > <address@hidden> wrote:
> >
> >
> > > Is it possible to have multiple different versions of the same 
> > > module installed >at the same time? Having read the documentation 
> > > and inspected existing >installed modules, the answer would appear 
> > > to be "no", but I thought I'd better >make sure.
> >
> > The simple answer is no.
> >
> > But, you can install the different versions
> > in different paths and then change environment variables like
> > GUILE_LOAD_PATH to make sure you are picking the one that you want.
> >
> > Of course, you can make it work if you really want to by
> > more drastic means that probably require that you load
> > the files at run-time or that you modify the modules to have
> > different 'define-module' declarations
> Also it's possible to do in guix

I  have no example at hand. You can set up environments using guix which 
will automatically setup the environment variables for you where you 
have a given version of dependency while your regular GUILE_LOAD_PATH 
has another version of the same lib or not at all.

That is what guix-tox afaiu for python deps.