anchor.diff:        ];
         urlPrefix = mirror://ubuntu;
         packages = commonDebPackages ++ [ "diffutils" "libc-bin" ];
  +    };
  +    debian9x86_64 = {
  +      name = "debian-stretch-amd64";
  +      fullName = "Debian Stretch (amd64)";
  +      packagesList = fetchurl {
  +        url = mirror://debian/dists/stretch/main/binary-amd64/Packages.xz;
  + 	sha256 = "1ihfcrrjz2nwh5wxa8b90m24b5z7q5p1h2ydfg9f1b6pdk81f6ji";
  +      };
  +      urlPrefix = mirror://debian;
  +      packages = commonDebianPackages;
  +    };
  +    debian9i386 = {
  +      name = "debian-stretch-i386";
  +      fullName = "Debian Stretch (i386)";
  +      packagesList = fetchurl {
  +        url = mirror://debian/dists/stretch/main/binary-i386/Packages.xz;
  + 	sha256 = "08gikw2pfm76fdl14b6sjx07dwp70ycgdj3zir296b7xrwiymima";
  +      };
  +      urlPrefix = mirror://debian;
  +      packages = commonDebianPackages;
       };
     };
   
  
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:       { 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";
  