(channel
 (version 0)
 (dependencies
  ; (channel 
    ; (name guix-past)
    ; (url "https://gitlab.inria.fr/guix-hpc/guix-past"))
  (channel
   (name guix-science)
   (url "https://github.com/guix-science/guix-science.git"))
  (channel (name nonguix)
   (url "https://gitlab.com/nonguix/nonguix"))
 ))