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diff --git a/info/filesys.h b/info/filesys.h
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+/* filesys.h -- external declarations for filesys.c.
+   $Id: filesys.h,v 1.7 2007/07/01 21:20:29 karl Exp $
+
+   Copyright (C) 1993, 1997, 1998, 2002, 2004, 2005, 2007 Free Software
+   Foundation, Inc.
+
+   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 3 of the License, 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, see <http://www.gnu.org/licenses/>.
+
+   Written by Brian Fox (bfox@ai.mit.edu). */
+
+#ifndef INFO_FILESYS_H
+#define INFO_FILESYS_H
+
+/* The path on which we look for info files.  You can initialize this
+   from the environment variable INFOPATH if there is one, or you can
+   call info_add_path () to add paths to the beginning or end of it. */
+extern char *infopath;
+
+/* Make INFOPATH have absolutely nothing in it. */
+extern void zap_infopath (void);
+
+/* Add PATH to the list of paths found in INFOPATH.  2nd argument says
+   whether to put PATH at the front or end of INFOPATH. */
+extern void info_add_path (char *path, int where);
+
+/* Defines that are passed along with the pathname to info_add_path (). */
+#define INFOPATH_PREPEND 0
+#define INFOPATH_APPEND  1
+
+/* Expand the filename in PARTIAL to make a real name for this operating
+   system.  This looks in INFO_PATHS in order to find the correct file.
+   If it can't find the file, it returns NULL. */
+extern char *info_find_fullpath (char *partial);
+
+/* Given a chunk of text and its length, convert all CRLF pairs at the
+   EOLs into a single Newline character.  Return the length of produced
+   text.  */
+long convert_eols (char *text, long textlen);
+
+/* Read the contents of PATHNAME, returning a buffer with the contents of
+   that file in it, and returning the size of that buffer in FILESIZE.
+   FINFO is a stat struct which has already been filled in by the caller.
+   If the file cannot be read, return a NULL pointer. */
+extern char *filesys_read_info_file (char *pathname, long int *filesize,
+    struct stat *finfo, int *is_compressed);
+
+extern char *filesys_read_compressed (char *pathname, long int *filesize);
+
+/* Return the command string that would be used to decompress FILENAME. */
+extern char *filesys_decompressor_for_file (char *filename);
+extern int compressed_filename_p (char *filename);
+
+/* A function which returns a pointer to a static buffer containing
+   an error message for FILENAME and ERROR_NUM. */
+extern char *filesys_error_string (char *filename, int error_num);
+
+/* The number of the most recent file system error. */
+extern int filesys_error_number;
+
+/* Given a string containing units of information separated by colons,
+   return the next one pointed to by IDX, or NULL if there are no more.
+   Advance IDX to the character after the colon. */
+extern char *extract_colon_unit (char *string, int *idx);
+
+/* Return true if FILENAME is `dir', with a possible compression suffix.  */
+extern int is_dir_name (char *filename);
+
+/* The default value of INFOPATH. */
+#if !defined (DEFAULT_INFOPATH)
+#  define DEFAULT_INFOPATH ".:/usr/local/info:/usr/info:/usr/local/lib/info:/usr/lib/info:/usr/local/gnu/info:/usr/local/gnu/lib/info:/usr/gnu/info:/usr/gnu/lib/info:/opt/gnu/info:/usr/share/info:/usr/share/lib/info:/usr/local/share/info:/usr/local/share/lib/info:/usr/gnu/lib/emacs/info:/usr/local/gnu/lib/emacs/info:/usr/local/lib/emacs/info:/usr/local/emacs/info"
+#endif /* !DEFAULT_INFOPATH */
+
+#if !defined (S_ISREG) && defined (S_IFREG)
+#  define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
+#endif /* !S_ISREG && S_IFREG */
+
+#if !defined (S_ISDIR) && defined (S_IFDIR)
+#  define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
+#endif /* !S_ISDIR && S_IFDIR */
+
+#endif /* not INFO_FILESYS_H */