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In my case I couldn’t get Rust working and ran into strange compilation issues with linker errors with the MacOS standard libraries. Tried installing them from Nix which fixed some problems but caused other ones.

Everything just worked outside of the Nix environment so ended up dropping it.

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https://flox.dev/docs/cookbook/languages/rust/

That describes how to get set up with Rust. Long story short, cargo depends on a linker and brings it along, but doesn’t expose it to other programs via PATH. If there are build scripts that call out to rustc or a linker directly then you need to explicitly install one. This is intentional, but yeah it can be surprising when you get an error about not finding a linker.

You also need libiconv on macOS for reasons, but all of this is described in the link above.

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