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# Languages and frameworks {#chap-language-support}
The [standard build environment](#chap-stdenv) makes it easy to build typical Autotools-based packages with very little code. Any other kind of package can be accommodated by overriding the appropriate phases of `stdenv`. However, there are specialised functions in Nixpkgs to easily build packages for other programming languages, such as Perl or Haskell. These are described in this chapter.
::: {.tip}
New to packaging? Start with [](#chap-first-package), then return here for the ecosystem you need.
:::
Each supported language or software ecosystem has its own package set named `<language or ecosystem>Packages`, which can be explored in various ways:
- Search on [search.nixos.org](https://search.nixos.org/packages)
For example, search for [`haskellPackages`](https://search.nixos.org/packages?query=haskellPackages) or [`rubyPackages`](https://search.nixos.org/packages?query=rubyPackages).
- Navigate attribute sets with [`nix repl`](https://nixos.org/manual/nix/stable/command-ref/new-cli/nix3-repl).
This technique is generally useful to inspect Nix language data structures.
:::{.example #example-navigte-nix-repl}
# Navigate Java compiler variants in `javaPackages` with `nix repl`
```shell-session
$ nix repl -f '<nixpkgs>' -I nixpkgs=channel:nixpkgs-unstable
nix-repl> javaPackages.<tab>
javaPackages.compiler javaPackages.openjfx15 javaPackages.openjfx21 javaPackages.recurseForDerivations
javaPackages.jogl_2_4_0 javaPackages.openjfx17 javaPackages.openjfx25
javaPackages.mavenfod javaPackages.openjfx19 javaPackages.override
javaPackages.openjfx11 javaPackages.openjfx20 javaPackages.overrideDerivation
```
:::
- List all derivations on the command line with [`nix-env --query`](https://nixos.org/manual/nix/stable/command-ref/nix-env/query).
`nix-env` is the only convenient way to do that, as it will skip attributes that fail [assertions](https://nixos.org/manual/nix/stable/language/constructs#assertions), such as when a package is [marked as broken](#var-meta-broken), rather than failing the entire evaluation.
:::{.example #example-list-haskellPackages}
# List all Python packages in Nixpkgs
The following command lists all [derivations names](https://nixos.org/manual/nix/stable/language/derivations#attr-name) with their attribute path from the latest Nixpkgs rolling release (`nixpkgs-unstable`).
```shell-session
$ nix-env -qaP -f '<nixpkgs>' -A pythonPackages -I nixpkgs=channel:nixpkgs-unstable
```
```console
pythonPackages.avahi avahi-0.8
pythonPackages.boost boost-1.81.0
pythonPackages.caffe caffe-1.0
pythonPackages.caffeWithCuda caffe-1.0
pythonPackages.cbeams cbeams-1.0.3
…
```
:::
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