On Sun, Jan 01, 2017 at 11:04:33PM -0500, Kei Kebreau wrote:
> Ah, this works excellently. Thanks for the pointer! The two attached
> patches should do the trick.

> From 41ce29321b21edc698a9ed2ce6dab09f2d190d50 Mon Sep 17 00:00:00 2001
> From: Kei Kebreau <kei@openmailbox.org>
> Date: Sun, 1 Jan 2017 21:49:04 -0500
> Subject: [PATCH] gnu: chicken: Update to 4.11.1.
> 
> * gnu/packages/scheme.scm (chicken): Update to 4.11.1.

>      (source (origin
>               (method url-fetch)
> -             (uri (string-append "http://code.call-cc.org/releases/"
> -                                 version "/chicken-" version ".tar.gz"))
> +             (uri (string-append "http://code.call-cc.org/dev-snapshots/"
> +                                 "/2016/09/12/chicken-" version ".tar.gz"))

I'd leave both URIs there, to make it easier on future readers.

Otherwise, LGTM!