Providing old package versions

The guix-past channel provides additional packages. It can be obtained by writing a snippet along these lines to ~/.config/guix/channels.scm and then running guix pull:

(append
  (list (channel
          (name 'guix-past)
          (url "https://gitlab.inria.fr/guix-hpc/guix-past")
          (branch "master")
          (introduction
            (make-channel-introduction
              "0c119db2ea86a389769f4d2b9c6f5c41c027e336"
              (openpgp-fingerprint
                "3CE4 6455 8A84 FDC6 9DB4  0CFB 090B 1199 3D9A EBB5")))))
  %default-channels)

To obtain substitutes (pre-built binaries) for the packages provided by this channel, configure your system to fetch substitutes from the URL below and authorize the corresponding key:
https://guix.bordeaux.inria.fr
(public-key
 (ecc
  (curve Ed25519)
  (q #89FBA276A976A8DE2A69774771A92C8C879E0F24614AAAAE23119608707B3F06#)))

Sourcehttps://gitlab.inria.fr/guix-hpc/guix-past
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