--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2004-04-27  Derek Price  <derek@ximbiot.com>
+
+	* m4/dos.m4 (gl_AC_DOS): Add Cygwin to list of Windows/DOS
+	environments that accept backslashes and drive letters in paths.
+
 2004-04-20  Jim Meyering  <jim@meyering.net>
 
 	* modules/dirfd: Change UTILS_ macro name prefix to gl_.

--- a/m4/dos.m4
+++ b/m4/dos.m4
@@ -1,8 +1,25 @@
-#serial 6
+#serial 7
 
 # Define some macros required for proper operation of code in lib/*.c
 # on MSDOS/Windows systems.
 
+# Copyright (C) 2000, 2001, 2004 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 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., 59 Temple Place - Suite 330, Boston, MA
+# 02111-1307, USA.
+
 # From Jim Meyering.
 
 AC_DEFUN([gl_AC_DOS],
@@ -10,7 +27,7 @@
     AC_CACHE_CHECK([whether system is Windows or MSDOS], [ac_cv_win_or_dos],
       [
         AC_TRY_COMPILE([],
-        [#if !defined _WIN32 && !defined __WIN32__ && !defined __MSDOS__
+        [#if !defined _WIN32 && !defined __WIN32__ && !defined __MSDOS__ && !defined __CYGWIN__
 neither MSDOS nor Windows
 #endif],
         [ac_cv_win_or_dos=yes],