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add instructions to extend the pkg-config search path to the "Embedding the Nix Evaluator" c api example #10629

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add instructions to extend the pkg-config search path to the "Embedding the Nix Evaluator" c api example #10629

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9 changes: 9 additions & 0 deletions doc/external-api/README.md
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Expand Up @@ -82,6 +82,15 @@ $ ./main
Nix version: 2.17
```

You might need to add the directory containing `nix-expr-c.pc` to the
`PKG_CONFIG_PATH` environment variable. For example after [building
Nix](https://github.com/NixOS/nix/blob/master/doc/manual/src/contributing/hacking.md#building-nix-with-flakes)
by executing the following.

```ShellSession
$ export PKG_CONFIG_PATH=$(realpath outputs/out/lib/pkgconfig):$PKG_CONFIG_PATH
```

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I think ideally we'd use nix develop --redirect to hook into the things Nixpkgs setup.sh does, but to be fair, so far I've preferred the robustness of just doing a full build on a fast machine.

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@prednaz prednaz May 16, 2024 •
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good point, thanks for the review! but this looks tricky and i do not think i can do this at the moment. so i will split this pull request so the other parts, #10723 and #10725, can already be merged.

# Writing a Nix language plug-in

In this example we add a custom primitive operation (_primop_) to `builtins`. It
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