{ }:
let
  ### Import nixpkgs with Niv ###
  #
  sources = import ./nix/sources.nix;
  # nixpkgs stable
  pkgs = import sources.nixpkgs {
    # Required for IntelliJ Ultimate
    config.allowUnfree = true;
  };
  # nixpkgs unstable
  unstable = import sources.unstable { };

  # https://github.com/NixOS/nixpkgs/blob/d9e98537533e7d978556bd58739813a47db5d591/pkgs/top-level/all-packages.nix#L14078-L14083
  jdk = unstable.jdk23.override {
    enableJavaFX = true;
    openjfx_jdk = unstable.openjfx23.override { withWebKit = true; };
  };

  # https://github.com/NixOS/nixpkgs/blob/23e89b7da85c3640bbc2173fe04f4bd114342367/pkgs/development/tools/build-managers/gradle/default.nix#L46
  gradle = unstable.gradle.override { java = jdk; };
in

(
  # Gradle's toolchain support does not work with IntelliJ, thus we have to use buildFHSUserEnv
  pkgs.buildFHSUserEnv
  {
    name = "intellij-gradle-jdk23";
    targetPkgs = pkgs_: [
      pkgs_.jetbrains.idea-ultimate
      jdk
      gradle
    ];
  }
).env