{ stdenv
, fetchurl
, pkgs
}:

let
  lua = pkgs.lua51Packages.lua;
in pkgs.lua51Packages.buildLuaPackage {
  name = "luaSha2";
  src = fetchurl {
    url = "https://sha2.googlecode.com/archive/02bd4bfdc8062c7e1ae51c5a72906efc0a6375ee.tar.gz";
    sha256 = "18v0pn10cs6133jzm80sj2aw0ycpls150k9p0gplagap6xhzp6j2";
  };
  buildPhase = ''
    gcc -L${lua}/lib -I$LUA_INC -I. sha2.c sha2lib.c -fPIC -DSHA2_USE_INTTYPES_H -DBYTE_ORDER -DLITTLE_ENDIAN -llua -shared -o sha2.so
  '';
  installPhase = ''
    mkdir -p $out/lib/lua/${lua.luaversion}
    install sha2.so $out/lib/lua/${lua.luaversion}
  '';
}