response 1 of 4:

May 15 16:47 UTC 1994

If you have a 386 or a 486, you might look at DJGPP, which is a port
of GCC to DOS.  It uses a DOS extender, though, so it requires a 386
or better and several megabytes of memory.  (The programs it compiles
also use this DOS extender, so you also need a 386 or better to
run anything you compile with it.)  Other than DJGPP, I've never seen a
decent shareware/freeware C compiler.  Most of the ones out there are
very old, pre-ANSI compilers, and aren't something I'd wish on anyone.
You'd be better off just buying Borland's Turbo C or something similar;
I think it's still around $100.

response 3 of 4:

May 15 17:17 UTC 1994

An excerpt from djgpp's readme file should get you going:

 
This is the README file for DJ's GCC port to DOS ("djgpp")
 
Contents:
    * Overview
    * What's available
    * How to install
    * Deviations and Caveats
    * Copyright information
 
Disclaimer: This software is distributed WITHOUT ANY WARRANTY; without
even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.
 
DJ Delorie
USmail: 24 Kirsten Ave, Rochester, NH 03867-2954, USA
email:  dj@ctron.com
 
mailing list: djgpp@sun.soe.clarkson.edu (listserv@sun.soe.clarkson.edu)
     djgpp-announce@sun.soe.clarkson.edu (listserv@sun.soe.clarkson.edu)
 
 
 
 
Overview:
 
This package contains a 32-bit 80386 DOS extender with symbolic
debugger, a C/C++ compiler with utilities, development libraries, and
source code.  It generates full 32-bit programs and supports full
virtual memory with paging to disk. 
 
Requirements:
 
A 80386-based IBM compatible PC or PS/2, approximately 4-5Mb of hard
drive space, and 512K RAM.  Available extended (or expanded under VCPI)
memory is strongly recommended.
 
Supported Wares:
 
* Up to 128M of extended memory (expanded under VCPI)
* Up to 128M of disk space used for swapping
* SuperVGA 256-color mode up to 1024x768
* 80387
* XMS & VDISK memory allocation strategies
* VCPI programs, such as QEMM, DESQview, and 386MAX
* DPMI programs, such as Windows 3.x, OS/2, and QDPMI
 
Unsupported:
 
* Multiprocessing (fork())
 
 
 
 
File location:
 
    host:      omnigate.clarkson.edu
    login:     ftp
    password:  send your e-mail address
    directory: ~ftp/pub/msdos/djgpp
 
Many thanks to the sysops at Clarkson for providing a home to djgpp!
 
As a convenience to non-FTP users, djgpp is also stored on Clarkson's
archive server.  To access the archive server, do this:
 
   % mail archive-server@omnigate.clarkson.edu
   Subject: <none>
   help
   index msdos/djgpp
   ^D
 
NOTE: In accordance with FSF CopyLeft, you are not allowed to upload
this program to a distribution site unless you upload the source modules
with any binary module you upload.  Please read the file COPYING for
more details. 
 
NOTE: If your application links in object modules that were written by
FSF, your application counts as a "derived work" and must obey the
provisions of the FSF Copyrights.  See the file COPYING for details. 
All FSF source-based libraries are in the file libgpl.a.  The mere act
of compiling does not affect the copyright status of your program. 
 
[rest of the readme file deleted]