diff -ur xxgdb-1.12/calldbx.c xxgdb-1.12.last/calldbx.c
--- xxgdb-1.12/calldbx.c	2005-07-30 22:21:47.000000000 +0900
+++ xxgdb-1.12.last/calldbx.c	2005-07-30 22:13:12.000000000 +0900
@@ -86,6 +86,11 @@
 #include        <sys/un.h>
 #endif /* CREATE_IO_WINDOW */
 
+#define Unix98	1
+#ifdef Unix98
+#include <signal.h>
+#endif
+
 #ifdef SVR4
 #define MASTER_CLONE "/dev/ptmx"
 #include <sys/types.h>
@@ -125,8 +130,13 @@
 static int open_master()
 {
     int master;
+#if Unix98
+    if ((master = open("/dev/ptmx", O_RDWR)) >= 0)
+		return master;
+	exit (1);
+#endif
     
-#ifdef SVR4				/* (MJH) Use STREAMS */
+#if defined(SVR4)		/* (MJH) Use STREAMS */
 
     if((master = open(MASTER_CLONE, O_RDWR)) < 0)
 	perror(MASTER_CLONE);
@@ -167,6 +177,22 @@
 {
     int slave;
 
+#if Unix98
+    char *slave_name = "unknown";
+    void (*handler)();
+
+    if(((handler = signal(SIGCHLD, SIG_DFL)) != SIG_ERR)
+			&& (grantpt(master) == 0)
+			&& (signal(SIGCHLD, handler) == SIG_DFL)
+			&& (unlockpt(master) == 0)
+			&& (slave_name = ptsname(master))) {
+    	fprintf(stderr, "open: slave %s\n", slave_name);
+    	if ((slave = open(slave_name, O_RDWR)) >= 0)
+    		return slave;
+	}
+	perror(slave_name);
+	exit(1);
+#else
 #ifdef SVR4				/* (MJH) */
     char *slave_name = "unknown";
     extern char *ptsname(int master);
@@ -194,6 +220,7 @@
 	    }
     return slave;
 #endif /* SVR4 */
+#endif /* Unix98 */
 }
 
 #ifdef CREATE_IO_WINDOW