	AIX 4.1.[45] and 4.2[.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.x and 10.20
	IRIX 5.3, 6.2, 6.3, and 6.4
	Linux 2.0.3[012] and 2.1.7[02] for Intel-based systems
	NetBSD 1.[23] for Intel and SPARC-based systems
	NEXTSTEP 3.1 for NEXTSTEP architectures
	OpenBSD 2.[012] for Intel-based systems
	Reliant UNIX 5.43 for Pyramid systems
	RISC/os 4.52 for MIPS R2000-based systems
	SCO OpenServer Release 3.0 and 5.0.[024] for Intel-based
	    systems
	SCO UnixWare 2.1.[12] for Intel-based systems
	Sequent PTX 2.1.9, 4.2.1, and 4.[34] for Sequent systems
	Solaris 2.[345], 2.5.1, and 2.6
	SunOS 4.1.x
	Ultrix 4.2
