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# D (Dlang) {#dlang}
Nixpkgs provides multiple D compilers such as `ldc`, `dmd` and `gdc`.
These can be used like any other package during build time.
However, Nixpkgs provides a build helper for compiling packages using the `dub` package manager.
Here's an example:
```nix
{
lib,
buildDubPackage,
fetchFromGitHub,
ncurses,
zlib,
}:
buildDubPackage rec {
pname = "btdu";
version = "0.5.1";
src = fetchFromGitHub {
owner = "CyberShadow";
repo = "btdu";
rev = "v${version}";
hash = "sha256-3sSZq+5UJH02IO0Y1yL3BLHDb4lk8k6awb5ZysBQciE=";
};
# generated by dub-to-nix, see below
dubLock = ./dub-lock.json;
buildInputs = [
ncurses
zlib
];
installPhase = ''
runHook preInstall
install -Dm755 btdu -t $out/bin
runHook postInstall
'';
}
```
Note that you need to define `installPhase` because `dub` doesn't know where files should go in `$out`.
Also note that running `dub test` is disabled by default. You can enable it by setting `doCheck = true`.
## Lockfiles {#dub-lockfiles}
Nixpkgs has its own lockfile format for `dub` dependencies, because `dub`'s official "lockfile" format (`dub.selections.json`) is not hash based.
A lockfile can be generated using the `dub-to-nix` helper package.
* Firstly, install `dub-to-nix` into your shell session by running `nix-shell -p dub-to-nix`
* Then navigate to the root of the source of the program you want to package
* Finally, run `dub-to-nix` and it will print the lockfile to stdout. You could pipe stdout into a text file or just copy the output manually into a file.
## `buildDubPackage` parameters {#builddubpackage-parameters}
The `buildDubPackage` function takes an attrset of parameters that are passed on to `stdenv.mkDerivation`.
The following parameters are specific to `buildDubPackage`:
* `dubLock`: A lockfile generated by `dub-to-nix` from the source of the package. Can be either a path to the file, or an attrset already parsed with `lib.importJSON`.
The latter useful if the package uses `dub` dependencies not already in the lockfile. (e.g. if the package calls `dub run some-dub-package` manually)
* `dubBuildType ? "release"`: The build type to pass to `dub build` as a value for the `--build=` flag.
* `dubFlags ? []`: The flags to pass to `dub build` and `dub test`.
* `dubBuildFlags ? []`: The flags to pass to `dub build`.
* `dubTestFlags ? []`: The flags to pass to `dub test`.
* `compiler ? ldc`: The D compiler to be used by `dub`.
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