How to use Guix.el from Git?

[Mathieu Lirzin <mthl@gnu.org>]

Hi,

I would like to use the Guix.el from the Git repository of Guix, but I
fail at configuring it.  I use Guix 0.9.0 built from source ontop of
Debian and installed with standard the “/usr/local” prefix.

It works perfectly with Guix.el from “/usr/local/share/emacs/site-lisp”
with the configuration describe in the manual:

  (add-to-list 'load-path "/usr/local/share/emacs/site-lisp")
  (require 'guix-init)

But when I try to replace this with the “Hacking” configuration from the
manual:

  (let ((dir "~/src/gnu/guix/emacs"))
    (add-to-list 'load-path dir)
    (setq guix-load-path dir))
  (require 'guix-init nil t)

I get this error when launching ‘M-x guix’:

--8<---------------cut here---------------start------------->8---
Backtrace:
In ice-9/boot-9.scm:
 157: 9 [catch #t #<catch-closure b12d60> ...]
In unknown file:
   ?: 8 [apply-smob/1 #<catch-closure b12d60>]
In ice-9/boot-9.scm:
  63: 7 [call-with-prompt prompt0 ...]
In ice-9/eval.scm:
 432: 6 [eval # #]
In ice-9/boot-9.scm:
2401: 5 [save-module-excursion #<procedure e2a740 at ice-9/boot-9.scm:4045:3 ()>]
4050: 4 [#<procedure e2a740 at ice-9/boot-9.scm:4045:3 ()>]
In unknown file:
   ?: 3 [load-compiled/vm "/home/mthl/.cache/guile/ccache/2.0-LE-8-2.0/home/mthl/src/gnu/guix/emacs/guix-helper.scm.go"]
In ice-9/boot-9.scm:
1724: 2 [%start-stack load-stack #<procedure d96580 at ice-9/boot-9.scm:1745:2 ()>]
1729: 1 [#<procedure d937b0 ()>]
In unknown file:
   ?: 0 [primitive-load-path "guix-main"]

ERROR: In procedure primitive-load-path:
ERROR: In procedure primitive-load-path: Unable to find file "guix-main" in load path
--8<---------------cut here---------------end--------------->8---

Am I missing something?

TIA,

--
Mathieu Lirzin