🚀 go-pugleaf

   now, the NeXT version seems to refer to an include file <objc/Object.h>,
   and the Stepstone version to <objc.h> to define primitive datastructures
   and types like Id. I can't find a corresponding file. Am I missing
   something

With gcc use <objc/Object.h>.   It's part of the distribution.   Look
for it. 

   Also, are there any PD Objective-C classes that correspond to Stepstone's
   IC-PAK, or NeXT's application builder clases?

At least two libraries are avaiable...

- Andrew McCallum has a collection library modeled after SmallTalk
classes but containing NeXT compatible List and Storage classes.
They are available from cs.rochester.edu

- A start (alpha version) of a class library that follows NeXT's
application builder classes (AppKit) is available from
ftp.slac.stanford.edu in directory pub/sources.   This library and gcc
give you two of the five components of OpenStep.
--
Paul F. Kunz	Paul_Kunz@slac.stanford.edu (NeXT mail ok)
Stanford Linear Accelerator Center, Stanford University
Voice: (415) 926-2884   (NeXT) Fax: (415) 926-3587