[csl]

Maybe not exactly what you need (sticky) but you can set UV_NO_BINARY=1

See https://docs.astral.sh/uv/reference/environment/#uv_no_binar...

[jimjag]

It helps, that's for sure. But this sort of knowledge should not exist in the environment in any case. It should be part of the canonical package list, and not hidden away elsewhere. The whole idea of a dependency manager should be a centralized and consistent way to install everything you need and not be dependent on what values may or may not exist as a env-var.

[wtallis]

Can you elaborate on the reasons why a package would need to declare that its dependencies must be installed from source rather than from pre-built binaries? I'm having trouble imagining a scenario where that capability would be used as anything other than a workaround for a deeper problem with how your dependencies are packaged.

[csl]

Yes, I can see how it would make sense to be able to set this in pyproject.toml (typically for private package)

uv is still quite new though. Perhaps you can open an issue and ask for that?