From mboxrd@z Thu Jan  1 00:00:00 1970
From: Leo Famulari <leo@famulari.name>
Subject: Re: [PATCH 6/9] gnu: fontforge: Make SVG builds reproducible.
Date: Wed, 6 Apr 2016 13:36:38 -0400
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To: ericbavier@openmailbox.org
Cc: guix-devel@gnu.org, Eric Bavier <bavier@member.fsf.org>

On Tue, Apr 05, 2016 at 11:32:58PM -0500, ericbavier@openmailbox.org wrote:
> From: Eric Bavier <bavier@member.fsf.org>
> 
> * gnu/packages/fontutils.scm (fontforge)[source]: Add snippet to clear
>   timestamp in svg.c.
> ---
>  gnu/packages/fontutils.scm | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/gnu/packages/fontutils.scm b/gnu/packages/fontutils.scm
> index 75edd55..5ca9835 100644
> --- a/gnu/packages/fontutils.scm
> +++ b/gnu/packages/fontutils.scm
> @@ -512,7 +512,12 @@ definitions.")
>                 ;; Make TTF builds bit-reproducible by clearing the timestamp
>                 ;; that goes in TTF files.
>                 (substitute* "fontforge/tottf.c"
> -                 (("cvt_unix_to_1904\\(now") "cvt_unix_to_1904(0"))))))
> +                 (("cvt_unix_to_1904\\(now") "cvt_unix_to_1904(0"))
> +
> +               ;; Make SVG builds bit-reproducible by clearing the timestamp
> +               ;; that goes in SVG files.
> +               (substitute* "fontforge/svg.c"
> +                 (("ctime\\(&now\\)") "ctime(0)"))))))

Could you use the value of the environment variable SOURCE_DATE_EPOCH
instead of 0?

>     (build-system gnu-build-system)
>     (native-inputs
>      `(("pkg-config" ,pkg-config)))
> -- 
> 2.7.3
> 
>