let pkgs = import <nixpkgs> {};
in with pkgs;

let
  # pkgs_old = builtins.fetchTarball {
  #   # Descriptive name to make the store path easier to identify
  #   name = "nixos-18.03";
  #   # Commit hash for nixos-unstable as of 2018-09-12
  #   url = https://github.com/NixOS/nixpkgs/archive/18.03.tar.gz;
  #   # Hash obtained using `nix-prefetch-url --unpack <url>`
  #   sha256 = "0hk4y2vkgm1qadpsm4b0q1vxq889jhxzjx3ragybrlwwg54mzp4f";
  # };

  # curl = callPackage (import (pkgs_old + "/pkgs/tools/networking/curl/default.nix")) { fetchurl = fetchurlBoot; };
# in curl

  curl = pkgs.curl.overrideAttrs (_: rec {
    name = "curl-7.59.0";
    src = fetchurl {
      urls = [
        "https://github.com/curl/curl/releases/download/${lib.replaceStrings ["."] ["_"] name}/${name}.tar.bz2"
        "https://curl.haxx.se/download/${name}.tar.bz2"
      ];
      sha256 = "185mazhi4bc5mc6rvhrmnc67j8l3sg7f0w2hp5gmi5ccdbyhz4mm";
    };
  });
  in curl