diff -uNr aterm-1.0.1/src/command.c aterm-1.0.1.mod/src/command.c
--- aterm-1.0.1/src/command.c	2006-06-26 21:01:20.000000000 +0300
+++ aterm-1.0.1.mod/src/command.c	2018-06-15 22:58:36.195350239 +0300
@@ -552,20 +552,10 @@
 {
     int             fd = -1;
 
-#if defined (__sgi)
-    ptydev = ttydev = _getpty(&fd, O_RDWR | O_NDELAY, 0622, 0);
-    if (ptydev == NULL)
-	goto Failed;
-#elif defined (__svr4__) || defined(__CYGWIN32__) || defined(__lnx21__)
-    {
 	extern char    *ptsname();
 
     /* open the STREAMS, clone device /dev/ptmx (master pty) */
-#ifdef HAVE_GETPT
-	if ((fd = getpt()) < 0) {
-#else
 	if ((fd = open("/dev/ptmx", O_RDWR)) < 0) {
-#endif
 		goto Failed;
 	} else {
 	    grantpt(fd);	/* change slave permissions */
@@ -573,61 +563,6 @@
 	    ptydev = ttydev = ptsname(fd);	/* get slave's name */
 	    goto Found;
 	}
-    }
-#elif defined (_AIX)
-    if ((fd = open("/dev/ptc", O_RDWR)) < 0)
-	goto Failed;
-    else
-	ptydev = ttydev = ttyname(fd);
-#elif defined(ALL_NUMERIC_PTYS)	/* SCO OSr5 */
-    static char     pty_name[] = "/dev/ptyp??\0\0\0";
-    static char     tty_name[] = "/dev/ttyp??\0\0\0";
-    int             len = strlen(tty_name);
-    char           *c1, *c2;
-    int             idx;
-
-    ptydev = pty_name;
-    ttydev = tty_name;
-
-    for (idx = 0; idx < 256; idx++) {
-	sprintf(ptydev, "%s%d", "/dev/ptyp", idx);
-	sprintf(ttydev, "%s%d", "/dev/ttyp", idx);
-
-	if (access(ttydev, F_OK) < 0) {
-	    idx = 256;
-	    break;
-	}
-	if ((fd = open(ptydev, O_RDWR)) >= 0) {
-	    if (access(ttydev, R_OK | W_OK) == 0)
-		goto Found;
-	    close(fd);
-	}
-    }
-    goto Failed;
-#else
-    static char     pty_name[] = "/dev/pty??";
-    static char     tty_name[] = "/dev/tty??";
-    int             len = strlen(tty_name);
-    char           *c1, *c2;
-
-    ptydev = pty_name;
-    ttydev = tty_name;
-
-# define PTYCHAR1	"pqrstuvwxyz"
-# define PTYCHAR2     "0123456789abcdefghijklmnopqrstuvwxyz"
-    for (c1 = PTYCHAR1; *c1; c1++) {
-	ptydev[len - 2] = ttydev[len - 2] = *c1;
-	for (c2 = PTYCHAR2; *c2; c2++) {
-	    ptydev[len - 1] = ttydev[len - 1] = *c2;
-	    if ((fd = open(ptydev, O_RDWR)) >= 0) {
-		if (access(ttydev, R_OK | W_OK) == 0)
-		    goto Found;
-		close(fd);
-	    }
-	}
-    }
-    goto Failed;
-#endif
 
   Found:
     fcntl(fd, F_SETFL, O_NDELAY);