`just`

This setup hook attempts to use the just command runner to build, check, and install the package. The hook overrides buildPhase, checkPhase, and installPhase by default.

The `justFlags` variable can be set to a list of strings to add additional flags passed to all invocations of `just`.

`buildPhase`

This phase attempts to invoke just with the default recipe.

This behavior can be disabled by setting `dontUseJustBuild` to `true`.

`checkPhase`

This phase attempts to invoke the just test recipe, if it is available. This can be overridden by setting checkTarget to a string.

This behavior can be disabled by setting `dontUseJustCheck` to `true`.

`installPhase`

This phase attempts to invoke the just install recipe.

This behavior can be disabled by setting `dontUseJustInstall` to `true`.

nixos.org/manual/nixpkgs/stable/hooks/just.html