This is output from `defines' version 4.1.1, from your buddies at Newtware! Fri Nov 24 08:01:30 HKT 2012 sysname=XENIX nodename=(empty) release=2.3.4 version=SysV machine=i80386 origin=3 oem=3000 serial#=556257 cc = [cc] M_BITFIELDS = 1 M_I386 = 1 M_I86 = 1 M_I86SM = 1 M_SDATA = 1 M_STEXT = 1 M_SYS3 = 1 M_SYS5 = 1 M_SYSIII = 1 M_SYSV = 1 M_WORDSWAP = 1 M_XENIX = 1