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From: gwyn@brl-tgr.ARPA (Doug Gwyn <gwyn>)
Newsgroups: net.unix-wizards
Subject: Re: Which *nix ? BSD : System V
Message-ID: <8317@brl-tgr.ARPA>
Date: Tue, 19-Feb-85 22:18:39 EST
Article-I.D.: brl-tgr.8317
Posted: Tue Feb 19 22:18:39 1985
Date-Received: Thu, 21-Feb-85 05:46:34 EST
References: <147@rtech.ARPA>
Distribution: net
Organization: Ballistic Research Lab
Lines: 12

> 	# include	<fcntl.h>
> 	# ifdef		FNDELAY
> 	# define	BSD
> 	# else
> 	# define	SYS5
> 	# endif

This should work on 4.2BSD and all UNIX System III and V releases.
It would be a compile-time error on older UNIXes.

I still prefer writing code for ONE environment rather than having
to juggle two at the same time.