let
  pkgs = import <nixpkgs> {};
in pkgs.stdenv.mkDerivation rec {

  name = "some_ruby_app";

  buildInputs = with pkgs; [
    stdenv
    gnumake
    llvm
    clang
    gcc
    gnutar
    gzip
    gawk
    gnused
    gnugrep
    findutils
    coreutils
    binutils
    ctags
    neovim
    which
    man
    bundler
    bundix
    git
    libiconv
    libxml2
    libxslt
    bzip2
    zlib
    pkgconfig
    imagemagickBig
    readline
    sqlite
    openssl
    postgresql
    redis
    ruby_2_5
];

  setup = ''
  '';

  builder = ''

  '';
  shellHook = ''
   echo "setting up shell"
   #unset PATH
   export LIBXML2_DIR=${pkgs.libxml2}
   export LIBXSLT_DIR=${pkgs.libxslt}
   export GEM_HOME=$PWD/.nix-gems
   export GEM_PATH=$out/vendor/cache:$GEM_HOME
   #for p in $buildInputs; do
   #  echo "adding $p to path"
   #  export PATH=$p/bin:$PATH
   #done
   export PATH=$GEM_HOME/bin:$PATH
  '';

}