Build failure ex_heroicons

[borgoat]

Hello, I'm struggling to build an app that has ex_heroicons (note this isn't the GitHub dependency on tailwindlabs/heroicons, but rather a Hex package that adds some convenience wrappers around that)¹

I reproduced the issue in the example project from this repo² and I get the following failure trying to build it:

╰─❯ nix build '.#example'
warning: Git tree '/home/borgoat/Workspace/github.com/code-supply/deps_nix' is dirty
error: Cannot build '/nix/store/mk8f9rn2gknjc1g3k9b7z9ifjhy85qw5-ex_heroicons-3.1.0.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/5mlyj3j2sg61sxbmbav958i9srwmnrkw-ex_heroicons-3.1.0
       Last 25 log lines:
       > Running phase: patchPhase
       > Running phase: updateAutotoolsGnuConfigScriptsPhase
       > Running phase: configurePhase
       > Running phase: buildPhase
       > Compiling 2 files (.ex)
       >
       > == Compilation error in file lib/heroicons.ex ==
       > ** (RuntimeError) Heroicons not found, please add the `heroicons` dependency to your project.
       >
       > Add `heroicons` to the list of dependencies in `mix.exs`:
       >
       >   def deps do
       >     [
       >       ...,
       >       {:heroicons,
       >       github: "tailwindlabs/heroicons",
       >       tag: "v2.1.5",
       >       sparse: "optimized",
       >       app: false,
       >       compile: false,
       >       depth: 1}
       >     ]
       >   end
       >
       >     lib/heroicons.ex:51: (module)
       For full logs, run:
         nix log /nix/store/mk8f9rn2gknjc1g3k9b7z9ifjhy85qw5-ex_heroicons-3.1.0.drv
error: Cannot build '/nix/store/gljwcaprq43vazli6flw5r8vnmhsxdaa-example-0.1.0.drv'.
       Reason: 1 dependency failed.
       Output paths:
         /nix/store/a4rpdhrw5w97fmj7j2gcyi8sfsg9lm83-example-0.1.0

I could track down the failure to this check that ex_heroicons performs at compile time, looking for the actual heroicons repo as a "peer dependency".³

However, in the derivation for ex_heroicons that folder won't be available.
I can't quite figure out a way around it, not sure if I'm doing something wrong, or there's no way this is supported out of the box.

Footnotes

1. https://hexdocs.pm/ex_heroicons/Heroicons.html ↩

2. https://github.com/borgoat/deps_nix/tree/ex_heroicons ↩

3. https://github.com/miguel-s/ex_heroicons/blob/eef79ce7eee702697b4442b6cc548bea994dcfcc/lib/heroicons.ex#L50-L69 ↩

[camelpunch]

Could you please try this again from deps_nix main branch?