(list (channel
       (name 'guix)
       ;; (url "file:///home/mab/src/git/guix")
       (url "https://git.savannah.gnu.org/git/guix.git")
       (commit "7357b3d7a52eb5db1674012c50d308d792741c48"))
      (channel
       (name 'guix-mab)
       (url "file:///home/mab/src/git/guix-mab")))