[delta_p_delta_x]

> If there are better solutions than submodules for these I would love to know.

https://learn.microsoft.com/en-gb/vcpkg/concepts/registries and

In essence:

- Publish your local/private mirror of the 3rd-party dep

- Edit the portfile for each dependency to point to your private repo, usually in `vcpkg_from_git`, `vcpkg_from_github`, `vcpkg_from_gitlab`, or `vcpkg_from_bitbucket`

- Publish these portfiles to your private vcpkg registry

- Set the registry in vcpkg-configuration.json (or the `vcpkg-configuration` field in vcpkg.json) to your private registry

Done.

[fsloth]

Thank you!