Guix can't build my dummy package definition

[Jérémy Korwin-Zmijowski]

Hey Guixters !

I am experimenting one way to learn how to use Guix for packaging. 

I've a package dummy definition in /tmp/def.scm:

(use-modules 
  (guix packages)
  (guix build-system emacs)
  (guix licenses)
  (guix git-download)) 

(define-public ac-geiser 
  (package 
    (name "")
    (version "") 
    (source
      (origin
        (uri
          (git-reference (url "") 
          (commit ""))) 
        (method git-fetch) 
        (sha256 (base32 ""))))
    (build-system emacs-build-system)
    (synopsis "")
    (description "") 
    (license bsd-3)
    (home-page "")))

Then when I do :

./pre-inst-env guix build -f /tmp/def.scm

I get :

guix build: error: #<unspecified>: not something we can build

What is Guix trying to tell yo me ? I have no clue... 

Does anybody have one ?

Cheers
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