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# Julia {#language-julia}
## Introduction {#julia-introduction}
Nixpkgs includes Julia as the `julia` derivation.
You can get specific versions by looking at the other `julia*` top-level derivations available.
For example, `julia_19` corresponds to Julia 1.9.
We also provide the current stable version as `julia-stable`, and an LTS version as `julia-lts`.
Occasionally, a Julia version has been too difficult to build from source in Nixpkgs and has been fetched prebuilt instead.
These Julia versions are differentiated with the `*-bin` suffix; for example, `julia-stable-bin`.
## julia.withPackages {#julia-withpackage}
The basic Julia derivations only provide the built-in packages that come with the distribution.
You can build Julia environments with additional packages using the `julia.withPackages` command.
This function accepts a list of strings representing Julia package names.
For example, you can build a Julia environment with the `Plots` package as follows.
```nix
julia.withPackages ["Plots"]
```
Arguments can be passed using `.override`.
For example:
```nix
(julia.withPackages.override {
precompile = false; # Turn off precompilation
}) ["Plots"]
```
Here's a nice way to run a Julia environment with a shell one-liner:
```sh
nix-shell -p 'julia.withPackages ["Plots"]' --run julia
```
### Arguments {#julia-withpackage-arguments}
* `precompile`: Whether to run `Pkg.precompile()` on the generated environment.
This will make package imports faster, but may fail in some cases.
For example, there is an upstream issue with `Gtk.jl` that prevents precompilation from working in the Nix build sandbox, because the precompiled code tries to access a display.
Packages like this will work fine if you build with `precompile=false`, and then precompile as needed once your environment starts.
Defaults: `true`
* `extraLibs`: Extra library dependencies that will be placed on the `LD_LIBRARY_PATH` for Julia.
Should not be needed as we try to obtain library dependencies automatically using Julia's artifacts system.
* `makeWrapperArgs`: Extra arguments to pass to the `makeWrapper` call which we use to wrap the Julia binary.
* `setDefaultDepot`: Whether to automatically prepend `$HOME/.julia` to the `JULIA_DEPOT_PATH`.
This is useful because Julia expects a writable depot path as the first entry, which the one we build in Nixpkgs is not.
If there's no writable depot, then Julia will show a warning and be unable to save command history logs etc.
Default: `true`
* `packageOverrides`: Allows you to override packages by name by passing an alternative source.
For example, you can use a custom version of the `LanguageServer` package by passing `packageOverrides = { "LanguageServer" = fetchFromGitHub {...}; }`.
* `augmentedRegistry`: Allows you to change the registry from which Julia packages are drawn.
This normally points at a special augmented version of the Julia [General packages registry](https://github.com/JuliaRegistries/General).
If you want to use a bleeding-edge version to pick up the latest package updates, you can plug in a later revision than the one in Nixpkgs.
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