AIX
_AIX
-BSD4_2
BSD_SYSTEM
CYGWIN Compiling the Cygwin port.
__CYGWIN__ Ditto
PURESIZE
RUN_TIME_REMAP
SETUP_SLAVE_PTY
-SIGALRM
-SIGCHLD
-SIGHUP
-SIGKILL
SIGNALS_VIA_CHARACTERS
-SIGPIPE
-SIGQUIT
-SIGTRAP
STDC_HEADERS
SYSTEM_PURESIZE_EXTRA
SYSTEM_MALLOC
TIME_WITH_SYS_TIME
TIOCSIGSEND
TM_IN_SYS_TIME
-ULIMIT_BREAK_VALUE
UNIX98_PTYS
USE_TOOLKIT_SCROLL_BARS
USG_SUBTTY_WORKS