anchor.diff:      flex
       ncurses
       readline
  -  ];
  -
  -  patches = [
  -    (fetchTritonPatch {
  -      rev = "f7da28f32f73a7a392b4f4bd0fbeb90e17fdbad0";
  -      file = "b/bc/fix-hang.patch";
  -      sha256 = "64719ac2d2a1622c241f5647973122d3ca742a28649875cd29ee957bf383dc38";
  -    })
     ];
   
     configureFlags = [
  
positive.code: }:
  
  stdenv.mkDerivation rec {
    name = "bc-1.07";
  
    src = fetchurl {
      url = "mirror://gnu/bc/${name}.tar.gz";
      hashOutput = false;
      sha256 = "55cf1fc33a728d7c3d386cc7b0cb556eb5bacf8e0cb5a3fcca7f109fc61205ad";
    };
  
    nativeBuildInputs = [
  
negative.code: { stdenv
  , ed
  , fetchurl
  , flex
  
  