# 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
```