anchor.diff:  
       cd ..
       ./configure
  +    runHook postConfigure
     '';
   
     buildPhase = ''
  +    runHook preBuild
       cd mp4v2
       make libmp4v2.la
   
  
positive.code: 
    hardeningDisable = [ "format" ];
  
    configurePhase = ''
      cd mp4v2
      ./configure
  
  
negative.code: { stdenv, fetchFromGitHub, fetchpatch }:
  
  stdenv.mkDerivation {
    name = "aacgain-1.9.0";
  