anchor.diff:  
     src = fetchurl {
       url = "https://acpica.org/sites/acpica/files/acpica-unix-${version'}.tar.gz";
  -    multihash = "QmYVtbFWVmZxFXTM3ZgQy7xH6fKtUDPx8ht6KJ7uyLYY63";
  -    sha256 = "70d11f3f2adbdc64a5b33753e1889918af811ec8050722fbee0fdfc3bfd29a4f";
  +    multihash = "QmaqR3MStuGyiYihahMBLA3Nsz3sBNQUwQvRhGAg4qHPTt";
  +    sha256 = "71133ab2b1b2e2f176a9b5081060571977a3d2c91b36722e198bffa7ce9b0d37";
     };
   
     nativeBuildInputs = [
  
positive.code:     install generate/unix/bin*/iasl $out/bin
    '';
  
    meta = with lib; {
      description = "Intel ACPI Compiler";
      homepage = http://www.acpica.org/;
  
negative.code:   inherit (lib)
      replaceChars;
  
    version = "2019-02-15";
    version' = replaceChars ["-"] [""] version;
  in
  stdenv.mkDerivation rec {
  