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diff --git a/lib/readline/rlwinsize.h b/lib/readline/rlwinsize.h
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+/* rlwinsize.h -- an attempt to isolate some of the system-specific defines
+ for `struct winsize' and TIOCGWINSZ. */
+
+/* Copyright (C) 1997-2009 Free Software Foundation, Inc.
+
+ This file is part of the GNU Readline Library (Readline), a library
+ for reading lines of text with interactive input and history editing.
+
+ Readline is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ Readline is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with Readline. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#if !defined (_RLWINSIZE_H_)
+#define _RLWINSIZE_H_
+
+#if defined (HAVE_CONFIG_H)
+# include "config.h"
+#endif
+
+/* Try to find the definitions of `struct winsize' and TIOGCWINSZ */
+
+#if defined (GWINSZ_IN_SYS_IOCTL) && !defined (TIOCGWINSZ)
+# include <sys/ioctl.h>
+#endif /* GWINSZ_IN_SYS_IOCTL && !TIOCGWINSZ */
+
+#if defined (STRUCT_WINSIZE_IN_TERMIOS) && !defined (STRUCT_WINSIZE_IN_SYS_IOCTL)
+# include <termios.h>
+#endif /* STRUCT_WINSIZE_IN_TERMIOS && !STRUCT_WINSIZE_IN_SYS_IOCTL */
+
+/* Not in either of the standard places, look around. */
+#if !defined (STRUCT_WINSIZE_IN_TERMIOS) && !defined (STRUCT_WINSIZE_IN_SYS_IOCTL)
+# if defined (HAVE_SYS_STREAM_H)
+# include <sys/stream.h>
+# endif /* HAVE_SYS_STREAM_H */
+# if defined (HAVE_SYS_PTEM_H) /* SVR4.2, at least, has it here */
+# include <sys/ptem.h>
+# define _IO_PTEM_H /* work around SVR4.2 1.1.4 bug */
+# endif /* HAVE_SYS_PTEM_H */
+# if defined (HAVE_SYS_PTE_H) /* ??? */
+# include <sys/pte.h>
+# endif /* HAVE_SYS_PTE_H */
+#endif /* !STRUCT_WINSIZE_IN_TERMIOS && !STRUCT_WINSIZE_IN_SYS_IOCTL */
+
+#if defined (M_UNIX) && !defined (_SCO_DS) && !defined (tcflow)
+# define tcflow(fd, action) ioctl(fd, TCXONC, action)
+#endif
+
+#endif /* _RL_WINSIZE_H */