From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ricardo Wurmus <rekado@elephly.net>
Subject: Re: Guix can't build my dummy package definition
Date: Sun, 01 Mar 2020 17:15:21 +0100
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References: <4D65396D-D8DA-42CC-9118-D470F9D5941D@korwin-zmijowski.fr>
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To: =?utf-8?B?SsOpcsOpbXk=?= Korwin-Zmijowski <jeremy@korwin-zmijowski.fr>
Cc: help-guix@gnu.org


Hi J=C3=A9r=C3=A9my,

> I've a package dummy definition in /tmp/def.scm:
>
> (use-modules=20
>   (guix packages)
>   (guix build-system emacs)
>   (guix licenses)
>   (guix git-download))=20
>
> (define-public ac-geiser=20
>   (package=20
>     (name "")
>     (version "")=20
>     (source
>       (origin
>         (uri
>           (git-reference (url "")=20
>           (commit "")))=20
>         (method git-fetch)=20
>         (sha256 (base32 ""))))
>     (build-system emacs-build-system)
>     (synopsis "")
>     (description "")=20
>     (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

This is because =E2=80=9Cdefine=E2=80=9D (or =E2=80=9Cdefine-public=E2=80=
=9D) does not return a value.
It returns an unspecified value.

When using =E2=80=9Cguix build=E2=80=9D with a file then the file must eval=
uate to a
package value.  This means it must end with a (package =E2=80=A6) expressio=
n or
the name of a variable that is bound to a package expression.

You can fix this by either adding =E2=80=9Cac-geiser=E2=80=9D to the bottom=
 of the file,
or by removing the (define-public ac-geiser =E2=80=A6) wrapping around the
package expression.

--=20
Ricardo