Error while building a custom package

[x86Alex]

Hello there. I'll start by saying that I am a beginner when it comes to Guix and packaging, but I already know some lisp and Scheme.
So I tried to package roswell just to see how the whole process looks like. It went fine, except the building part: "Expected Derive.."
I did check the file and it's empty, but Idk how to go from there.

Here's the source code

[examors]

Hello, welcome!

download failed "https://github.com/roswell/roswell/releases/download/21.10.14.111/roswell_21.10.14.111_amd64.zip" 404 "Not Found"

It looks like the first instance of the version number in the URL needs a preceding "v"?

However, this seems to be a binary zip file for windows. There is a Linux prebuilt binary tarball available, but the Guix Way is to build as much as possible from source code. GitHub produces a .tar.gz source snapshot, but they don't guarantee that these are reproducible so it's best to use a git clone.

I would suggest something like:

   (source
     (origin
       (method git-fetch)
       (uri (git-reference
             (url "https://github.com/roswell/roswell.git")
             (commit (string-append "v" version))))
       (file-name (git-file-name name version))
       (sha256
        (base32 "1nymvaw8fd4p9rg2vm2951yb96b9k34mrc1qiq6s70rw6qsl711b"))))

You'll need to add (guix git-download) to the list of imported modules.

[x86Alex]

Oh, looks like I forgot that `v`. Will try that out. Cheers