feedback from Klemens, thanks
  #include <libutil.h>
 #endif
 
-#ifndef __OpenBSD__
-#define pledge(a,b) 0
-#endif
-
 /* Arbitrary sizes */
 #define UTF_INVALID   0xFFFD
 #define UTF_SIZ       4
                        die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
                close(s);
                close(m);
+#ifdef __OpenBSD__
                if (pledge("stdio getpw proc exec", NULL) == -1)
                        die("pledge\n");
+#endif
                execsh(cmd, args);
                break;
        default:
+#ifdef __OpenBSD__
                if (pledge("stdio rpath tty proc", NULL) == -1)
                        die("pledge\n");
+#endif
                close(s);
                cmdfd = m;
                signal(SIGCHLD, sigchld);