Binary compatibility for SCO UnixWare 2.1.X

When compiling applications with the UnixWare and OpenServer Development Kit on UnixWare 7 for use on SCO UnixWare 2.1.X:

1. don't use libc functions that don't exist on SCO UnixWare 2.1.X (these are listed in the table below); otherwise, you can use any of the functions that are part of the documented libc interface (documented on the Section 2 manual pages, Section 3C manual pages, and Section 3S manual pages)

2. load the BCM for SCO UnixWare 2.1.X on the target system before attempting to run your application

The following functions defined in the UnixWare 7 implementation of libc do not exist in the SCO UnixWare 2.1.X implementation and should not be used in an application written for SCO UnixWare 2.1.X:

UnixWare 7 libc functions and macros not on SCO UnixWare 2.1.X
fgetpos64	ftruncate64	strncoll
fopen64	ftw64	strnxfrm
freopen64	lockf64	tmpfile64
fseeko64	nftw64	todigit
fsetpos64	readdir64	toint
ftello64	readdir64_r	truncate64