anchor.diff:  
   let
     version = "2.37";
  +
  +  version_ = lib.replaceChars ["."] ["_"] version;
   in
   stdenv.mkDerivation rec {
     name = "dejavu-fonts-${version}";
   
     src = fetchurl {
  -    url = "mirror://sourceforge/dejavu/dejavu-fonts-${version}.tar.bz2";
  -    multihash = "QmYnZ3hkSocQJoBdQX8FqoPCVWbnvwiubciVVxCfLnGPe2";
  -    fullOpts = {
  -      md5Confirm = "41e4ea9f903674923d1ef61bd88bcb41";
  -    };
  +    urls = [
  +      "https://github.com/dejavu-fonts/dejavu-fonts/releases/download/version_${version_}/${name}.tar.bz2"
  +      "mirror://sourceforge/dejavu/${name}.tar.bz2"
  +    ];
       sha256 = "4b21c5203f792343d5e90ab1cb0cf07e99887218abe3d83cd9a98cea9085e799";
     };
   
  
positive.code: { stdenv
  , fetchurl
  
  , fontconfig
  , fontforge
  
negative.code:     done;
    '';
  
    meta = with lib; {
      description = "A typeface family based on the Bitstream Vera fonts";
      homepage = http://dejavu-fonts.org/;
      license = licenses.free; # BitstreamVera & public domain
  