Dae San Hwang ha scritto:

> (It's not GNU's, I think it's NetBSD's.)

Yes, you are right.

head /usr/include/readline/readline.h
/*      $NetBSD: readline.h,v 1.11 2004/01/17 17:57:40 christos Exp $   */

/*-
  * Copyright (c) 1997 The NetBSD Foundation, Inc.
  * All rights reserved.
....

However it's not perfectly gnu-compatible. I haven't tried with ruby (I 
installed readline 5 from sources), but with GiNaC interpreter it does 
not compile.