HylaFAX is intended to run on any UNIX system that supports
a particular set of features: FIFO special files, BSD-style
sockets and the TCP/IP communication protocols,
BSD-style file locking (flock) or equivalent functionality
from which it can be emulated (fcntl, lockf), and
POSIX 1003.1-style interfaces, including termios for manipulating
tty devices.
The following systems are known to have these features:
AIX v3.x, BSD/386, FreeBSD, HP-UX 9.x, IRIX,
ISC4.0, Linux, OSF/1 V1.3 and V3.0, SCO 3.2v4 (ODT 3), Solaris 2.x,
SunOS 4.1.x, System V Release 4 on an Intel x86, Ultrix 4.4.