anchor.diff:  
   # https://helpx.adobe.com/flash-player/kb/archived-flash-player-versions.html
   
  +# FIXME
   # Requires gcc's libstdc++.so.6
  -assert stdenv.cc.isGNU;
  +#assert stdenv.cc.isGNU;
   
   let
     inherit (lib)
  
positive.code: 
    flashPlayerLibs = makeSearchPath "lib" [
      stdenv.cc.cc
      stdenv.libc
    ];
  
    preUnpack = ''
  
negative.code: 
    sources = {
      "stable" = {
        version = "32.0.0.142";
        sha256 = "6e422fb3b47b53595842f3788d7b3bddac0f200078f88b7e8eebcfcbb90f673f";
      };
      "beta" = {
        version = "24.0.0.154";
  