anchor.diff:        { name = "saucy";
   	b64 = ubuntu1310x86_64;
   	b32 = ubuntu1310i386; }
  +      { name = "jessie";
  +	b64 = debian8x86_64;
  +	b32 = debian8i386; }
  +      { name = "stretch";
  +	b64 = debian9x86_64;
  +	b32 = debian9i386; }
       ] ({ name, b64, b32, extra ? [] }: let
         dsc = vmBuild {
           name = "rethinkdb-${sourcePrep.version}-${name}-src";
  
positive.code:       packagesLists = [
  	(fetchurl {
  	   url = mirror://ubuntu/dists/yakkety/main/binary-i386/Packages.xz;
             sha256 = "13r75sp4slqy8w32y5dnr7pp7p3cfvavyr1g7gwnlkyrq4zx4ahy"; # TODO
          })
          (fetchurl {
            url = mirror://ubuntu/dists/yakkety/universe/binary-i386/Packages.xz;
            sha256 = "14fid1rqm3sc0wlygcvn0yx5aljf51c2jpd4x0zxij4019316hsh"; # TODO
          })
        ];
        urlPrefix = mirror://ubuntu;
  
negative.code:       inherit diskImage;
      });
  
    # TODO: remove when accepted upstream: https://github.com/NixOS/nixpkgs/pull/22009
    customDebDistros = with pkgs; with vmTools; with debDistros; debDistros // {
      ubuntu1610i386 = {
        name = "ubuntu-16.10-yakkety-i386";
  