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# Tcl {#sec-language-tcl}
## User guide {#sec-language-tcl-user-guide}
Tcl interpreters are available under the `tcl` and `tcl-X_Y` attributes, where `X_Y` is the Tcl version.
Tcl libraries are available in the `tclPackages` attribute set.
They are only guaranteed to work with the default Tcl version, but will probably also work with others thanks to the [stubs mechanism](https://wiki.tcl-lang.org/page/Stubs).
## Packaging guide {#sec-language-tcl-packaging}
Tcl packages are typically built with `tclPackages.mkTclDerivation`.
Tcl dependencies go in `buildInputs`/`nativeBuildInputs`/... like other packages.
For more complex package definitions, such as packages with mixed languages, use `tcl.tclPackageHook`.
Where possible, make sure to enable stubs for maximum compatibility, usually with the `--enable-stubs` configure flag.
Here is a simple package example to be called with `tclPackages.callPackage`.
```
{ lib, fetchzip, mkTclDerivation, openssl }:
mkTclDerivation rec {
pname = "tcltls";
version = "1.7.22";
src = fetchzip {
url = "https://core.tcl-lang.org/tcltls/uv/tcltls-${version}.tar.gz";
hash = "sha256-TOouWcQc3MNyJtaAGUGbaQoaCWVe6g3BPERct/V65vk=";
};
buildInputs = [ openssl ];
configureFlags = [
"--with-ssl-dir=${openssl.dev}"
"--enable-stubs"
];
meta = {
homepage = "https://core.tcl-lang.org/tcltls/index";
description = "OpenSSL / RSA-bsafe Tcl extension";
maintainers = [ lib.maintainers.agbrooks ];
license = lib.licenses.tcltk;
platforms = lib.platforms.unix;
};
}
```
All Tcl libraries are declared in `pkgs/top-level/tcl-packages.nix` and are defined in `pkgs/development/tcl-modules/`.
If possible, prefer the by-name hierarchy in `pkgs/development/tcl-modules/by-name/`.
Its use is documented in `pkgs/development/tcl-modules/by-name/README.md`.
All Tcl applications reside elsewhere.
In case a package is used as both a library and an application (for example `expect`), it should be defined in `tcl-packages.nix`, with an alias elsewhere.
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