--- gforth/engine/io.c	1997/05/21 20:40:09	1.1
+++ gforth/engine/io.c	1997/06/15 19:43:48	1.2
@@ -85,12 +85,15 @@
 #endif /* !_POSIX_VERSION */
 
 /* Posix systems use termios and the Posix signal functions. */
-#if defined (_POSIX_VERSION)
+#if defined (_POSIX_VERSION) || defined (NeXT)
 #  if !defined (TERMIOS_MISSING)
 #    undef NEW_TTY_DRIVER
 #    define TERMIOS_TTY_DRIVER
 #    include <termios.h>
 #  endif /* !TERMIOS_MISSING */
+#endif /* _POSIX_VERSION || NeXT */
+
+#if defined (_POSIX_VERSION)
 #  define HAVE_POSIX_SIGNALS
 #  if !defined (O_NDELAY)
 #    define O_NDELAY O_NONBLOCK	/* Posix-style non-blocking i/o */
@@ -107,7 +110,7 @@
    special character is disabled and to disable certain special
    characters.  Posix systems should set to 0, USG systems to -1. */
 #if !defined (NEW_TTY_DRIVER) && !defined (_POSIX_VDISABLE)
-#  if defined (_POSIX_VERSION)
+#  if defined (_POSIX_VERSION) || defined (NeXT)
 #    define _POSIX_VDISABLE 0
 #  else /* !_POSIX_VERSION */
 #    define _POSIX_VDISABLE -1