(NSIG): Remove.
(NSIG_MINIMUM): New macro.
* m/cydra5.h, m/dpx2.h, m/mips.h, m/pfa50.h, m/sps7.h, m/stride.h,
m/ustation.h:
(SIGIO): Do not undef.
(BROKEN_SIGIO): New macro.
* m/ustation.h:
(SIGTSTP): Do not undef.
(BROKEN_SIGTSTP): New macro.
* m/delta.h: Doc fix.
(HAVE_XSCREENNUMBEROFSCREEN): defined if X is used.
(LIB_X11_LIB, LIBX11_SYSTEM): override only if X is used.
(USG_SHARED_LIBRARIES): undefine only if X is used.
(HAVE_SYSVIPC, BAT68K, BAT_ALLOCA): Deleted--obsolete.
(STACK_DIRECTION, HAVE_X_WINDOWS): Deleted--configure knows.
(C_SWITCH_MACHINE): Set to -ga if using the Green Hills compiler.
(LIB_STANDARD, LIB_MATH): Defined to the 68881 versions.
(LIBS_SYSTEM): -lbsd brings sigblock and sigsetmask.
(sigsetmask): Undefined--it is in -lbsd.
(LDAV_SYMBOL): Undefined--we have no such thing.
(KERNEL_FILE): Defined to "/sysV68".
(BSTRING, HAVE_SELECT, HAVE_UNISTD_H, HAVE_TIMEVAL): Defined.
(SIGNALS_VIA_CHARACTERS): Defined.
(memmove): Defined as memcpy--we have no memmove.
(SIGIO, INTERRUPT_INPUT): Undefined--not yet tested.
(SHORT_FILE_NAMES, CLASH_DETECTION): Defined.