On Mon, Jul 10, 2017 at 09:25:27PM +0100, Niall Dooley wrote:
> OK, so it has finished but unsuccessfully. The last lines of the output were
> as follows but none of the packages were installed. To reach this point it
> took about 50 mins (it started around 19:55 and finished at 20:43).

That sounds annoying :(

> The following packages will be installed:
>    r-caret 6.0-76 /gnu/store/dybi25l6wr14y3cxw6xazans9vlqjlji-r-caret-6.0-76
>    r-ggplot2 2.2.1 /gnu/store/11jzzbgpg67v3yysiv6pyhi27f75dyh1-r-ggplot2-2.2.1
>    r-rpart 4.1-11 /gnu/store/rrsr0q4q4n2wjfg26kyg4klk708f675f-r-rpart-4.1-11
>    r-e1071 1.6-8 /gnu/store/1r4if4p10rnyj6q073yjir99mpriv1d0-r-e1071-1.6-8
>    r-randomforest 4.6-12
> /gnu/store/nkqqls9piqzp7pdgfrka1rz005hxj19c-r-randomforest-4.6-12
>    r-rocr 1.0-7 /gnu/store/ldn5y4qcz6kxgqkhld69w00lvbiz9682-r-rocr-1.0-7
>    r-class 7.3-14 /gnu/store/bqx4c9r3pzmf12vlfy2hdw8hamk8z45n-r-class-7.3-14
> 
> guix package: error: profile contains conflicting entries for r-mass:out
> guix package: error:   first entry: r-mass@7.3-47:out
> /gnu/store/z0nxbji8yrkdl7n6v3wdsd8iqcj39vyk-r-mass-7.3-47
> guix package: error:    ... propagated from r-car@2.1-4
> guix package: error:    ... propagated from r-caret@6.0-76
> guix package: error:   second entry: r-mass@7.3-47:out
> /gnu/store/gnv11ncv2h9ij48jwy86wai3xsm7c9s5-r-mass-7.3-47
> guix package: error:    ... propagated from r@3.4.0

I recommend updating all the packages that are trying to propagate
r-mass. That is, R, r-car, and r-caret. We recently made a change to
throw an error here:

https://bugs.gnu.org/27271

I don't fully understand the impact of the change so I asked Ludovic to
chime in.

> I had previously installed successfully R and r-catools via Guix.
> 
> Ok, I see. And is there something I need to do to only install the pre-built
> substitutes and not to install from source?

Guix is a build-from-source distro that can offer pre-built binary
substitutes as a side-effect of the functional package management model.
Your request has been discussed previously but, AFAIK, it's not being
worked on at the moment.

We are currently bringing some more x86_64 / i686 build machines online,
so the build / substitute ratio should improve soon. We know it should
be better.