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: 
    sources = {
      "stable" = {
        version = "31.0.0.108";
        sha256 = "iA+Z/cArsqmwIIt9gz7cqxw4xE2t0W7VJ0vpwD3LycA=";
      };
      "beta" = {
        version = "24.0.0.154";
  
negative.code: 
    flashPlayerLibs = makeSearchPath "lib" [
      stdenv.cc.cc
      stdenv.cc.libc
    ];
  
    preUnpack = ''
  