#define ENOTSOCK (_SIGN 74) /* Socket operation on non-socket */
#define ENOPROTOOPT (_SIGN 75) /* Protocol not available */
#define EOPNOTSUPP (_SIGN 76) /* Operation not supported */
+#define ENOTSUP EOPNOTSUP /* Not supported */
#define ENETDOWN (_SIGN 77) /* network is down */
/* The following are not POSIX errors, but they can still happen.
.en 73 EMSGSIZE "Message too long
.en 74 ENOTSOCK "Socket operation on non-socket
.en 75 ENOPROTOOPT "Protocol not available
-.en 76 EOPNOTSUPP "Operation not supported
+.en 76 EOPNOTSUPP "Operation not supported (has alias ENOTSUP)
.en 77 ENETDOWN "Network is down
.ig
.en XXX EDQUOT "Disc quota exceeded"