{cabal}:

cabal.mkDerivation (self : {
  pname = "stm";
  version = "2.2.0.1"; # Haskell Platform 2011.2.0.0
  sha256 = "1p0x414ffsd77mmlfz1cmwg2cbhinnbpxypxgvygg05js67msj8q";
  meta = {
    description = "Software Transactional Memory";
  };
})