docs: Building a stdenv package in nix-shell (#216650)

genericBuild

```

### Building a `stdenv` package in `nix-shell` {#sec-building-stdenv-package-in-nix-shell}

To build a `stdenv` package in a [`nix-shell`](https://nixos.org/manual/nix/unstable/command-ref/nix-shell.html), use

```bash

nix-shell '<nixpkgs>' -A some_package

eval ${unpackPhase:-unpackPhase}

cd $sourceRoot

eval ${patchPhase:-patchPhase}

eval ${configurePhase:-configurePhase}

eval ${buildPhase:-buildPhase}

```

To modify a [phase](#sec-stdenv-phases), first print it with

```bash

type buildPhase

```

then change it in a text editor, and paste it back to the terminal.

## Tools provided by `stdenv` {#sec-tools-of-stdenv}

The standard environment provides the following packages: