anchor.diff:  let
     inherit (stdenv)
       targetSystem;
  -  inherit (stdenv.lib)
  +  inherit (lib)
  +    boolEn
       elem
  -    enFlag
       platforms;
   in
   stdenv.mkDerivation rec {
  -  name = "flac-1.3.1";
  +  name = "flac-1.3.2";
   
     src = fetchurl {
       url = "http://downloads.xiph.org/releases/flac/${name}.tar.xz";
  -    sha256 = "4773c0099dba767d963fd92143263be338c48702172e8754b9bc5103efe1c56c";
  +    multihash = "QmZLYKX7bcZtUopiGmMzUCUGJDn1TEgqXvJtUw7M8KtjZU";
  +    sha256 = "e48764f0761beb791a69590f12826fe8cf302c42db2879849c5d10bc7c85db66";
     };
   
  -  configureFLags = [
  +  configureFlags = [
       "--enable-largefile"
       "--enable-asm-optimizations"
       "--disable-debug"
  -    (enFlag "sse" (elem targetSystem platforms.x86-all) null)
  -    (enFlag "altivec" (elem targetSystem platforms.powerpc-all) null)
  +    "--${boolEn (elem targetSystem platforms.x86-all)}-sse"
  +    "--${boolEn (elem targetSystem platforms.powerpc-all)}-altivec"
  +    "--${boolEn (elem targetSystem platforms.x86-all)}-avx"
       "--disable-thorough-tests"
       "--disable-exhaustive-tests"
       "--disable-werror"
       "--disable-stack-smash-protection"
  +    "--enable-64-bit-words"
       "--disable-valgrind-testing"
       "--disable-doxygen-docs"
       "--disable-local-xmms-plugin"
  
positive.code: { stdenv
  , fetchurl
  
  , libogg
  }:
  
negative.code:     libogg
    ];
  
    doCheck = false;
  
    meta = with lib; {
      description = "FLAC lossless audio file format";
      homepage = http://xiph.org/flac/;
      license = with licenses; [
  