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: 
    hardeningDisable = [ "format" ];
  
    postPatch = ''
      (
        cd mp4v2
        patch -p0 < ${fetchpatch {
          name = "fix_missing_ptr_deref.patch";
          url = "https://aur.archlinux.org/cgit/aur.git/plain/fix_missing_ptr_deref.patch?h=aacgain-cvs&id=e1a19c920f57063e64bab75cb0d8624731f6e3d7";
          sha256 = "1cq7r005nvmwdjb25z80grcam7jv6k57jnl2bh349mg3ajmslbq9";
        }}
      )
    '';
  
    configurePhase = ''
      runHook preConfigure
      cd mp4v2
      ./configure
  
  