anchor.diff:    inherit name;
     inherit version;
   
  -  src = fetchurl {
  -    url = real_url;
  -    inherit sha256;
  -  };
  +  inherit src;
   
     prefixKey = "-prefix ";
     configureFlags =
  
positive.code: assert aflSupport -> stdenv.lib.versionAtLeast version "4.05";
  assert flambdaSupport -> stdenv.lib.versionAtLeast version "4.03";
  assert spaceTimeSupport -> stdenv.lib.versionAtLeast version "4.04";
  
  let
     useNativeCompilers = !stdenv.isMips;
  
negative.code: { minor_version, major_version, patch_version
  , ...}@args:
  let
    versionNoPatch = "${toString major_version}.${toString minor_version}";
    version = "${versionNoPatch}.${toString patch_version}";
    safeX11 = stdenv: !(stdenv.isAarch32 || stdenv.isMips);
  in
  
  