Re: Xpdf with or without Qt

[zimoun]

Hi Andreas,

On Fri, 26 Feb 2021 at 18:02, Andreas Enge <andreas@enge.fr> wrote:

> How can I personally keep the old variant?

I would go with inferior.

  <https://guix.gnu.org/manual/devel/en/guix.html#Inferiors>

--8<---------------cut here---------------start------------->8---
(use-modules (guix inferior) (guix channels)
             (srfi srfi-1))   ;for 'first'

(define channels
  ;; This is the old revision from which we want to
  ;; extract xpdf
  (list (channel
         (name 'guix)
         (url "https://git.savannah.gnu.org/git/guix.git";)
         (commit
          "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"))))

(define inferior
  (inferior-for-channels channels))

(packages->manifest
 (list (first (lookup-inferior-packages inferior "xpdf"))
       (map
         specification->package
         (list
           "foo"
           "bar"
           …))))
--8<---------------cut here---------------end--------------->8---

where xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx is the last commit
containing the version you like.


Hope that helps,
simon