WINDOWSNT Compiling the native MS-Windows (W32) port.
__MINGW32__ Compiling the W32 port with the MinGW port of GCC.
_MSC_VER Compiling the W32 port with the Microsoft C compiler.
+IRIX6_5 Compiling on Irix-6.5
** Distinguishing GUIs **
INTERRUPT_INPUT
IRIS
IRIS_4D
-IRIX6_5
-IRIX_FORCE_32_BITS
KERNEL_FILE
LDAV_SYMBOL
LD_SWITCH_MACHINE
NONSYSTEM_DIR_LIBRARY
NOT_C_CODE
NO_ARG_ARRAY
-NO_MODE_T
NO_REMAP
NO_SIOCTL_H
NO_SOCK_SIGIO
SEGMENT_MASK
SEGSIZ
SETUP_SLAVE_PTY
-SHORTNAMES
SIGMASKTYPE
SIGNALS_VIA_CHARACTERS
SIGN_EXTEND_CHAR