1 files changed, 4 insertions, 8 deletions
diff --git a/zwgc/mux.c b/zwgc/mux.c
index a682267..221ae8b 100644
--- a/zwgc/mux.c
+++ b/zwgc/mux.c
@@ -12,8 +12,10 @@
  *      "mit-copyright.h".
  */
 
+#include <sysdep.h>
+
 #if (!defined(lint) && !defined(SABER))
-static char rcsid_mux_c[] = "$Id$";
+static const char rcsid_mux_c[] = "$Id$";
 #endif
 
 /****************************************************************************/
@@ -22,12 +24,6 @@ static char rcsid_mux_c[] = "$Id$";
 /*                                                                          */
 /****************************************************************************/
 
-#include <sys/types.h>
-#include <sys/time.h>
-#include <sys/file.h>
-#include <fcntl.h>
-#include <errno.h>
-#include <stdio.h>
 #include <zephyr/zephyr.h>
 #include "mux.h"
 #include "error.h"
@@ -201,7 +197,7 @@ static int check_tty()
 
     if (tty < 0) return 0;
 
-#if defined(POSIX) || defined(SUNOS)
+#if defined(_POSIX_VERSION)
     result = ( ((pgrp = tcgetpgrp(tty)) < 0)      ? 0 : 1 );
 #else
     result = ( (ioctl(tty, TIOCGPGRP, &pgrp) < 0) ? 0 : 1 );