Arun Isaac <arunisaac@systemreboot.net> writes:

> * gnu/packages/image.scm (optipng): New variable.
> ---
>  gnu/packages/image.scm | 33 +++++++++++++++++++++++++++++++++
>  1 file changed, 33 insertions(+)
>
> diff --git a/gnu/packages/image.scm b/gnu/packages/image.scm
> index 931cad1..4039c1a 100644
> --- a/gnu/packages/image.scm
> +++ b/gnu/packages/image.scm
> @@ -10,6 +10,7 @@
>  ;;; Copyright © 2016 Efraim Flashner <efraim@flashner.co.il>
>  ;;; Copyright © 2016 Tobias Geerinckx-Rice <me@tobias.gr>
>  ;;; Copyright © 2016 Eric Bavier <bavier@member.fsf.org>
> +;;; Copyright © 2016 Arun Isaac <arunisaac@systemreboot.net>
>  ;;;
>  ;;; This file is part of GNU Guix.
>  ;;;
> @@ -932,3 +933,35 @@ statistical tests.")
>  all included libraries only the image loading and decoding library is
>  installed as @code{stb_image}.")
>        (license license:public-domain))))
> +
> +(define-public optipng
> +  (package
> +    (name "optipng")
> +    (version "0.7.6")
> +    (source
> +     (origin
> +       (method url-fetch)
> +       (uri (string-append "http://prdownloads.sourceforge.net/optipng/optipng-"
> +                           version ".tar.gz"))
> +       (sha256
> +        (base32
> +         "105yk5qykvhiahzag67gm36s2kplxf6qn5hay02md0nkrcgn6w28"))))
> +    (build-system gnu-build-system)
> +    (inputs
> +     `(("zlib" ,zlib)))
> +    (arguments
> +     '(#:phases
> +       (modify-phases %standard-phases
> +         ;; configure script does not accept arguments CONFIG_SHELL and SHELL
> +         (replace 'configure
> +           (lambda* (#:key outputs #:allow-other-keys)
> +             (zero? (system* "sh" "configure"
> +                             (string-append "--prefix=" (assoc-ref outputs "out")))))))))
> +    (synopsis "Optimizer that recompresses PNG image files to a
> +smaller size")
> +    (description "OptiPNG is a PNG optimizer that recompresses image
> +files to a smaller size, without losing any information.  This program
> +also converts external formats (BMP, GIF, PNM and TIFF) to optimized
> +PNG, and performs PNG integrity checks and corrections.")
> +    (home-page "http://optipng.sourceforge.net/")
> +    (license license:zlib)))

Linting and reproducibility are clean here!

Pushed as 93117227034666db18c8b0c7fd89cca72a3eeca8.