anchor.diff:  
   (define-socket-call ("setsockopt" %setsockopt) :int
     "Configure a socket."
  -  (fd      fd)
  +  (socket  fd)
     (level   :int)
     (optname :int)
     (optval  :pointer)
  
positive.code: 
  (define-socket-call ("getsockopt" %getsockopt) :int
    "Retrieve socket configuration."
    (fd      fd)
    (level   :int)
    (optname :int)
    (optval  :pointer)
  
negative.code: 
  (define-socket-call ("bind" %bind) :int
    "Bind a socket to a particular local address."
    (socket  fd)
    (address :pointer)
    (addrlen socklen))
  
  