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	(BSD4_4, SVR4, HAVE_SETSID, HAVE_UNIX_DOMAIN): #define these.
	(FIRST_PTY_LETTER): This is 'r', not 'p'.
	(HAVE_TERMIO, SIGNALS_VIA_CHARACTERS): Don't #define these.
	(HAVE_TERMIOS): #define these instead.
	(XREBINDKEYSYM):  Don't #define.
	Test THIS_IS_YMAKEFILE instead of MAKING_MAKEFILE.
	(sigmask, sigpause): #undef these after #including <signal.h>.
	(LD_SWITCH_SYSTEM, START_FILES, LIBS_SYSTEM, LIB_GCC): #define
	these to avoid problems with /lib/crt0.o.
	(C_DEBUG_SWITCH, C_OPTIMIZE_SWITCH): #define these.