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(LD_SWITCH_MACHINE): Defined.
(ORDINARY_LINK): Defined unconditionally.

Don't change auto-mode-alist.
(tar-regexp): Deleted.
(tar-normal-mode): Deleted.
(tar-mode): Add autoload.

(set-auto-mode): Handle inhibit-local-variables-regexps.

Change  ! "${...}"  to  x"${...}" = x  everywhere.

Defend against negative baud_rate.

Include systty.h; don't mess with FIONREAD.
Don't include termio.h dorectly.

(rem): Use cl-truncate.

etc directory, as well as lots of things from ${srcdir}/etc.

Do nothing if window contents not entirely visible.

of the fcc temp buffer.  It got lost somewhere.

(arith_driver, Frem): Likewise.

(BSD): Don't define.
(read, write, open, close): Defined.
(INTERRUPTIBLE_OPEN, INTERRUPTIBLE_CLOSE, INTERRUPTIBLE_IO): Defined.
(C_SWITCH_SYSTEM): Defined.