diff --git a/include/ChangeLog b/include/ChangeLog
index 76e73fb4e..1937bcaf5 100644
--- a/include/ChangeLog
+++ b/include/ChangeLog
@@ -1,3 +1,9 @@
+2000-05-26  Eli Zaretskii  <eliz@is.elta.co.il>
+
+	* filenames.h: New file.
+	(HAVE_DOS_BASED_FILE_SYSTEM, IS_DIR_SEPARATOR)
+	(IS_ABSOLUTE_PATH, FILENAME_CMP): New macros.
+
 2000-05-17  S. Bharadwaj Yadavalli  <sby@scrugs.lkg.dec.com>
 	    Rick Gorton	            <gorton@scrugs.lkg.dec.com>
 	    
diff --git a/include/filenames.h b/include/filenames.h
new file mode 100644
index 000000000..ba933c853
--- /dev/null
+++ b/include/filenames.h
@@ -0,0 +1,51 @@
+/* Macros for taking apart, interpreting and processing file names.
+
+   These are here because some non-Posix (a.k.a. DOSish) systems have
+   drive letter brain-damage at the beginning of an absolute file name,
+   use forward- and back-slash in path names interchangeably, and
+   some of them have case-insensitive file names.
+
+   Copyright 2000 Free Software Foundation, Inc.
+
+This file is part of BFD, the Binary File Descriptor library.
+
+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 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, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#ifndef FILENAMES_H
+#define FILENAMES_H
+
+#if defined(__MSDOS__) || defined(_WIN32) || defined(__OS2__)
+
+#ifndef HAVE_DOS_BASED_FILE_SYSTEM
+#define HAVE_DOS_BASED_FILE_SYSTEM 1
+#endif
+
+#define IS_DIR_SEPARATOR(c)	((c) == '/' || (c) == '\\')
+/* Note that IS_ABSOLUTE_PATH accepts d:foo as well, although it is
+   only semi-absolute.  This is because the users of IS_ABSOLUTE_PATH
+   want to know whether to prepend the current working directory to
+   a file name, which should not be done with a name like d:foo.  */
+#define IS_ABSOLUTE_PATH(f)	(IS_DIR_SEPARATOR((f)[0]) || (((f)[0]) && ((f)[1] == ':')))
+#define FILENAME_CMP(s1, s2)	strcasecmp(s1, s2)
+
+#else  /* not DOSish */
+
+#define IS_DIR_SEPARATOR(c)	((c) == '/')
+#define IS_ABSOLUTE_PATH(f)	(IS_DIR_SEPARATOR((f)[0]))
+#define FILENAME_CMP(s1, s2)	strcmp(s1, s2)
+
+#endif /* not DOSish */
+
+#endif /* FILENAMES_H */