anchor.diff:  , configFile ? "all"
   
   # Userspace dependencies
  -, zlib, libuuid, python, attr
  +, zlib, libuuid, python, attr, openssl
   
   # Kernel dependencies
   , kernel ? null, spl ? null, splUnstable ? null
  
positive.code:     incompatibleKernelVersion = null;
  
      # this package should point to a version / git revision compatible with the latest kernel release
      version = "2017-09-26";
  
      rev = "7e98073379353a05498ac5a2f1a5df2a2257d6b0";
      sha256 = "1hydfhmngpq31gxkxipqxnin74l760d1ia202h12vsgix9sp32h7";
      isUnstable = true;
  
      extraPatches = [
  
negative.code:       nativeBuildInputs = [ autoreconfHook nukeReferences ];
        buildInputs =
             optionals buildKernel [ spl ]
          ++ optionals buildUser [ zlib libuuid python attr ]
          ++ optionals (buildUser && isUnstable) [ openssl ];
  
        # for zdb to get the rpath to libgcc_s, needed for pthread_cancel to work
        NIX_CFLAGS_LINK = "-lgcc_s";
  