On Mon, Mar 20, 2017 at 07:03:03AM +0100, John Darrington wrote:
>      > +    (source (origin
>      > +              (method url-fetch)
>      > +              (uri (string-append "mirror://sourceforge/itpp/itpp/"
>      > +                                  version "/itpp-"
>      > +                                  version ".tar.gz"))
>      > +       (sha256
>      > +        (base32
>      > +         "14ddy2xnb6sgp4hiax9v5sv4pr4l4dd4ps76nfha3nrpr1ikhcqm"))))

(sha256) should be indented from (origin).