Use correct OpenSSL thread safety macros on OS X (closes #209) Create an Autoconf test to determine if pthread_t is a pointer or scalar type, and use the appropriate CRYPTO_THREADID_set macro based on the result.

fun main n =
  case n of
      0 => error <xml>Zero is bad! <button value="Capische?" onclick={alert "GOOD!"}/></xml>
    | _ => return <xml/>