let
  pkgs = import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/nixpkgs-unstable.tar.gz") {};

  # Override jarl to skip failing tests
  jarl = pkgs.jarl.overrideAttrs (oldAttrs: {
    doCheck = false;
  });

  rpkgs = builtins.attrValues {
    inherit (pkgs.rPackages)
      asdreader
      hyperSpec
      jsonlite
      knitr
      prospectr
      R6
      Rcpp
      rmarkdown
      stringr
      geometry
      clhs
      testthat
      devtools
      roxygen2
      lintr
      styler;
  };

  system_packages = builtins.attrValues {
    inherit (pkgs)
      R
      glibcLocalesUtf8;
  } ++ [ jarl ];
in

pkgs.mkShell {
  LOCALE_ARCHIVE = if pkgs.stdenv.hostPlatform.system == "x86_64-linux" then "${pkgs.glibcLocalesUtf8}/lib/locale/locale-archive" else "";
  LANG = "en_US.UTF-8";
  LC_ALL = "en_US.UTF-8";
  LC_TIME = "en_US.UTF-8";
  LC_MONETARY = "en_US.UTF-8";
  LC_PAPER = "en_US.UTF-8";
  LC_MEASUREMENT = "en_US.UTF-8";

  buildInputs = [ system_packages rpkgs ];

}