Want help with writing package recipe

[Joshua Branson]

    Hello,

    I'm trying to write a recipe to install GNU typist: 
http://www.gnu.org/software/gtypist/

    Just to be clear, one cannot install gtypist with "guix package -i 
gtypist", because guix does not currently have a recipe for gtypist.

    Anyway, I used guix download <path to tarball> to download the 
tarball for gtypist. It is stored locally on my machine in this path:
    /nix/store/lzxd537h0plmskizrldx6lmpyacl2d40-gtypist-2.9.4.tar.gz

    I used guix hash -f base32 to export the base32 hash, which is: 
i5q225g6twsg5egicgpt6ub7hn4m7pdzg56hwxx57jm4o4ns5fgq

    I've written a recipe for gtypist located here: 
http://pastebin.com/ysLHJUWg

    But now, I'm stuck. I'm not sure how to tell guix to run the 
recipe. Guix's documentation says that the command "guix build options 
package-or-derivation"
    will build the package into a binary that I can run on my machine. 
I can't say "guix build gtypist", because guix does not currently have a 
recipe to build gtypist,     and I can't say "guix build options 
/path/to/gtypist.dri", because there is not a derivation file on my 
machine for gtypist.

     What do I do next to build this package? How do I submit a patch 
when I get it working?

    Thanks,

    Joshua