anchor.diff:  
       cd ..
       ./configure
  +    runHook postConfigure
     '';
   
     buildPhase = ''
  +    runHook preBuild
       cd mp4v2
       make libmp4v2.la
   
  
positive.code: { stdenv, fetchFromGitHub }:
  
  stdenv.mkDerivation {
    name = "aacgain-1.9.0";
  
negative.code: 
      cd ..
      make
      runHook postBuild
    '';
  
    installPhase = ''
      install -D aacgain/aacgain "$out/bin/aacgain"
    '';
  
    meta = with stdenv.lib; {
      description = "ReplayGain for AAC files";
      homepage = https://github.com/mulx/aacgain;
      license = licenses.gpl2;
      platforms = platforms.linux;
      maintainers = [ maintainers.robbinch ];
    };
  }
  