Expression evaluation for plural form selection.

diff --git a/gettext-tools/src/plural-eval.h b/gettext-tools/src/plural-eval.h
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+/* Expression evaluation for plural form selection.
+   Copyright (C) 2005 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 2005.
+
+   This program 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 2, or (at your option)
+   any later version.
+
+   This program 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 this program; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+#ifndef _PLURAL_EVAL_H
+#define _PLURAL_EVAL_H
+
+
+/* Definition of 'struct expression', and
+   declaration of extract_plural_expression() and plural_eval().  */
+#include "plural-exp.h"
+
+
+/* Protection against signals during plural evaluation.  */
+
+#include <setjmp.h>
+
+/* Some platforms don't have the sigjmp_buf type in <setjmp.h>.  */
+#if defined _MSC_VER || defined __MINGW32__
+/* Native Woe32 API.  */
+# define sigjmp_buf jmp_buf
+# define sigsetjmp(env,savesigs) setjmp (env)
+# define siglongjmp longjmp
+#endif
+
+/* We use siginfo to get precise information about the signal.
+   But siginfo doesn't work on Irix 6.5.  */
+#if HAVE_SIGINFO && !defined (__sgi)
+# define USE_SIGINFO 1
+#endif
+
+/* Exit point.  Must be set before calling install_sigfpe_handler().  */
+extern sigjmp_buf sigfpe_exit;
+
+#if USE_SIGINFO
+/* Additional information that is set before sigfpe_exit is invoked.  */
+extern int sigfpe_code;
+#endif
+
+/* Protect against signals during plural evaluation.  Must be called around
+   calls to plural_eval().  Must be called in pairs.  */
+extern void install_sigfpe_handler (void);
+extern void uninstall_sigfpe_handler (void);
+
+
+#endif /* _PLURAL_EVAL_H */