--- term.c	2007-08-30 06:46:50.000000000 +0900
+++ /tmp/term.c.fixed	2007-09-03 09:15:22.915209300 +0900
@@ -3131,6 +3131,10 @@
       setpgrp ();
       no_controlling_tty = 1;
 #else
+#ifdef CYGWIN
+      setsid ();
+      no_controlling_tty = 1;
+#else
 #ifdef TIOCNOTTY                /* Try BSD ioctls. */
       sigblock (sigmask (SIGTTOU));
       fd = emacs_open ("/dev/tty", O_RDWR, 0);
@@ -3145,6 +3149,7 @@
       /* Unknown system. */
       croak ();
 #endif  /* ! TIOCNOTTY */
+#endif  /* ! CYGWIN */
 #endif  /* ! USG */
     }
 #endif