	AIX 4.1.[45], 4.2[.1], and 4.3[.1]
	BSDI BSD/OS 2.1 and 3.[01] for Intel-based systems
	DC/OSx 1.1 for Pyramid systems
	Digital UNIX (DEC OSF/1) 2.0, 3.2, and 4.0
	FreeBSD 2.1.[67], 2.2 and 3.0 for Intel-based systems
	HP-UX 9.01, 10.20, and 11.00
	Linux 2.0.3[234] and 2.1.8[89] for Intel-based systems
	NetBSD 1.[23] for Intel and SPARC-based systems
	NEXTSTEP 3.1 for NEXTSTEP architectures
	OpenBSD 2.[0123] for Intel-based systems
	Reliant UNIX 5.4[34] for Pyramid systems
	SCO OpenServer Release 3.0 and 5.0.[024] for Intel-based
	    systems
	SCO UnixWare 2.1.[12] and 7[.0.1] for Intel-based systems
	Sequent PTX 2.1.9, 4.2.[13], 4.[34], and 4.4[.12] for
	    Sequent systems
	Solaris 2.5.1, and 2.[67]
	SunOS 4.1.x
	Ultrix 4.2
