{ pkgs ? import <nixpkgs> { } }:
pkgs.mkShell {

  buildInputs = with pkgs; [
    rustc
    cargo
    rustfmt

    cairo
    geos
    clipper

    clang
    llvm
    pkg-config

    (pkgs.writers.writeBashBin "reformat" ''
      for file in `find ${toString ./.} -type f | egrep "\.rs$"`
      do
        ${pkgs.rustfmt}/bin/rustfmt "$file"
      done
    '')
  ];

  # run this on start
  # -----------------
  shellHook = ''
    # export NIX_ENFORCE_PURITY=0

    # Needed so bindgen can find libclang.so
    export LIBCLANG_PATH="${pkgs.llvmPackages.libclang}/lib";
  '';

}