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diff --git a/gnu/usr.bin/texinfo/intl/plural-exp.h b/gnu/usr.bin/texinfo/intl/plural-exp.h
new file mode 100644
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+++ b/gnu/usr.bin/texinfo/intl/plural-exp.h
@@ -0,0 +1,122 @@
+/* Expression parsing and evaluation for plural form selection.
+   Copyright (C) 2000, 2001 Free Software Foundation, Inc.
+   Written by Ulrich Drepper <drepper@cygnus.com>, 2000.
+
+   This program is free software; you can redistribute it and/or modify it
+   under the terms of the GNU Library 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+   USA.  */
+
+#ifndef _PLURAL_EXP_H
+#define _PLURAL_EXP_H
+
+#ifndef PARAMS
+# if __STDC__ || defined __GNUC__ || defined __SUNPRO_C || defined __cplusplus || __PROTOTYPES
+#  define PARAMS(args) args
+# else
+#  define PARAMS(args) ()
+# endif
+#endif
+
+#ifndef internal_function
+# define internal_function
+#endif
+
+
+/* This is the representation of the expressions to determine the
+   plural form.  */
+struct expression
+{
+  int nargs;			/* Number of arguments.  */
+  enum operator
+  {
+    /* Without arguments:  */
+    var,			/* The variable "n".  */
+    num,			/* Decimal number.  */
+    /* Unary operators:  */
+    lnot,			/* Logical NOT.  */
+    /* Binary operators:  */
+    mult,			/* Multiplication.  */
+    divide,			/* Division.  */
+    module,			/* Modulo operation.  */
+    plus,			/* Addition.  */
+    minus,			/* Subtraction.  */
+    less_than,			/* Comparison.  */
+    greater_than,		/* Comparison.  */
+    less_or_equal,		/* Comparison.  */
+    greater_or_equal,		/* Comparison.  */
+    equal,			/* Comparison for equality.  */
+    not_equal,			/* Comparison for inequality.  */
+    land,			/* Logical AND.  */
+    lor,			/* Logical OR.  */
+    /* Ternary operators:  */
+    qmop			/* Question mark operator.  */
+  } operation;
+  union
+  {
+    unsigned long int num;	/* Number value for `num'.  */
+    struct expression *args[3];	/* Up to three arguments.  */
+  } val;
+};
+
+/* This is the data structure to pass information to the parser and get
+   the result in a thread-safe way.  */
+struct parse_args
+{
+  const char *cp;
+  struct expression *res;
+};
+
+
+/* Names for the libintl functions are a problem.  This source code is used
+   1. in the GNU C Library library,
+   2. in the GNU libintl library,
+   3. in the GNU gettext tools.
+   The function names in each situation must be different, to allow for
+   binary incompatible changes in 'struct expression'.  Furthermore,
+   1. in the GNU C Library library, the names have a __ prefix,
+   2.+3. in the GNU libintl library and in the GNU gettext tools, the names
+         must follow ANSI C and not start with __.
+   So we have to distinguish the three cases.  */
+#ifdef _LIBC
+# define FREE_EXPRESSION __gettext_free_exp
+# define PLURAL_PARSE __gettextparse
+# define GERMANIC_PLURAL __gettext_germanic_plural
+# define EXTRACT_PLURAL_EXPRESSION __gettext_extract_plural
+#elif defined (IN_LIBINTL)
+# define FREE_EXPRESSION gettext_free_exp__
+# define PLURAL_PARSE gettextparse__
+# define GERMANIC_PLURAL gettext_germanic_plural__
+# define EXTRACT_PLURAL_EXPRESSION gettext_extract_plural__
+#else
+# define FREE_EXPRESSION free_plural_expression
+# define PLURAL_PARSE parse_plural_expression
+# define GERMANIC_PLURAL germanic_plural
+# define EXTRACT_PLURAL_EXPRESSION extract_plural_expression
+#endif
+
+extern void FREE_EXPRESSION PARAMS ((struct expression *exp))
+     internal_function;
+extern int PLURAL_PARSE PARAMS ((void *arg));
+extern struct expression GERMANIC_PLURAL;
+extern void EXTRACT_PLURAL_EXPRESSION PARAMS ((const char *nullentry,
+					       struct expression **pluralp,
+					       unsigned long int *npluralsp))
+     internal_function;
+
+#if !defined (_LIBC) && !defined (IN_LIBINTL)
+extern unsigned long int plural_eval PARAMS ((struct expression *pexp,
+					      unsigned long int n));
+#endif
+
+#endif /* _PLURAL_EXP_H */