That version only works with 1.8. There is an updated fork though, sexp_processor: https://github.com/seattlerb/sexp_processor https://github.com/seattlerb/sex

That version only works with 1.8. There is an updated fork though, sexp_processor: https://github.com/seattlerb/sexp_processor https://github.com/seattlerb/sexp_processor