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# 17-package-from-source
This example shows packaging a selected local source tree.
It includes:
- a derivation built from a local source tree,
- `lib.fileset.toSource` to include only selected files, and
- a check that proves excluded files are not in the packaged source.
Useful commands:
```bash
nix build
./result/bin/source-greet
nix run
nix flake check
```