packaging help

[Yagnesh Raghava Yakkala <hi@yagnesh.org>]

Hello,

I am trying to package UDUNITS2¹ which is a dependency of Netcdf4. I am
getting an syntax error while building guix.

I pasted the following in maths.scm (similar to units package definition). 

--8<---------------cut here---------------start------------->8---
(define-public udunits
  (package
    (name "udunits")
    (version "2.2.4")
    (source (origin
              (method url-fetch)
              (uri (string-append "ftp://ftp.unidata.ucar.edu/pub/udunits/udunits-" version
                                  "-Source.tar.gz"))
              (sha256 (base32
                       "04zs1jcn90gl58ypbb8sqg9ddq4dc7md3a3xmlgi2xabbj136arh"))))
    (build-system gnu-build-system)
    (arguments `(#:tests? #f
                          #:configure-flags '("--with-pic")))
    (synopsis "C library provides for arithmetic manipulation of units and for
conversion of numeric values between compatible units")
    (description
     "The UDUNITS package supports units of physical quantities. Its C library
provides for arithmetic manipulation of units and for conversion of numeric
values between compatible units. The package contains an extensive unit
database, which is in XML format and user-extendable. The package also
contains a command-line utility for investigating units and converting
values.")
    (license license:x11-style "https://raw.githubusercontent.com/Unidata/UDUNITS-2/master/COPYRIGHT")
    (home-page "http://www.unidata.ucar.edu/software/udunits/")))
--8<---------------cut here---------------end--------------->8---

Now when I try to build guix by running make the following syntax error coming
up.

--8<---------------cut here---------------start------------->8---
;;; note: source file ./guix/config.scm
;;;       newer than compiled /home/yagnesh/repos/gu/guix/guix/config.go
ice-9/boot-9.scm:106:20: In procedure #<procedure a53b40 at ice-9/boot-9.scm:97:6 (thrown-k . args)>:
ice-9/boot-9.scm:106:20: Syntax error:
gnu/packages/maths.scm:73:2: source expression failed to match any pattern in form (package (name "udunits") (version "2.2.4") (source (origin (method url-fetch) (uri (string-append "ftp://ftp.unidata.ucar.edu/pub/udunits/udunits-" version "-Source.tar.gz")) (sha256 (base32 "04zs1jcn90gl58ypbb8sqg9ddq4dc7md3a3xmlgi2xabbj136arh")))) (build-system gnu-build-system) (arguments (quasiquote (#:tests? #f #:configure-flags (quote ("--with-pic"))))) (synopsis "C library provides for arithmetic manipulation of units and for\nconversion of numeric values between compatible units") (description "The UDUNITS package supports units of physical quantities. Its C library\nprovides for arithmetic manipulation of units and for conversion of numeric\nvalues between compatible units. The package contains an extensive unit\ndatabase, which is in XML format and user-extendable. The package also\ncontains a command-line utility for investigating units and converting\nvalues.") (license license:x11-style "https://raw.githubusercontent.com/Unidata/UDUNITS-2/master/COPYRIGHT") (home-page "http://www.unidata.ucar.edu/software/udunits/"))
make[2]: *** [gnu/packages/maths.go] Error 1
make[2]: Leaving directory `/home/yagnesh/repos/gu/guix'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/yagnesh/repos/gu/guix'
make: *** [all] Error 2
--8<---------------cut here---------------end--------------->8---

Seems I am making basic mistake. Thanks for any hints.

¹  http://www.unidata.ucar.edu/software/udunits/
Thanks.
-- 
ఎందరో మహానుభావులు అందరికి వందనములు.
YYR