Subject: Re: Error: The function DEFCLASS is undefined
From: Erik Naggum <>
Date: 05 Oct 2002 13:18:58 +0000
Newsgroups: comp.lang.lisp
Message-ID: <>

* Zhongtao Zhu
| I just get GCL-2.4.1 installed and try to use it.  Unluckily I have
| trouble with it.

  GCL is still a very old Common Lisp and does not purport to conform (as
  the formal language goes) to the ANSI standard for Common Lisp.  It is a
  Common Lisp that refers to the 1984 book Common Lisp the Language.  Books
  on Lisp from the same time period will be most useful with GCL.

| I guess I might miss something important before the statement. How can I
| use the `DEFCLASS' correctly?  I would apologize for this naive question.

  Use any of the other free Common Lisp implementations.  Since you have
  just installed it, it should not be a loss to deinstall it and install
  the Trial Edition of Allegro CL from Franz Inc <>, or the
  Personal Edition of LispWorks from Xanalys <>, or any of
  the supposedly free, but generally having the same kind of restrictions
  as the above free offerings from commercial vendors, implementations
  CMUCL, SBCL, or CLISP.  Depending on your platform, there are also
  Macintosh Common Lisp, Corwin Common Lisp, and several others.

  See <> for more information.

Erik Naggum, Oslo, Norway

Act from reason, and failure makes you rethink and study harder.
Act from faith, and failure makes you blame someone and push harder.