--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/s/cygwin64.h	Mon Apr 21 11:42:50 2014 +0100
@@ -0,0 +1,96 @@
+/* system description file for cygwin32.
+   Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc.
+   Copyright (C) 2001 Ben Wing.
+
+This file is part of XEmacs.
+
+XEmacs 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.
+
+XEmacs 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 XEmacs.  If not, see <http://www.gnu.org/licenses/>. */
+
+/* Building under cygwin
+ *
+ * The approach I have taken with this port is to use primarily the
+ * UNIX code base adding stuff that is MS-Windows specific. This works
+ * quite well, and is in keeping with my perception of the cygwin
+ * philosophy.  Note that if you make changes to this file you do NOT
+ * want to define WIN32_NATIVE (formerly "WINDOWSNT"), I repeat - do
+ * not define this, it will break everything horribly. What does get
+ * defined is HAVE_MS_WINDOWS, but this is done by configure and only
+ * applies to the window system.
+ *
+ * When building make sure your HOME path is unix style - i.e. without
+ * a drive letter.
+ *
+ * once you have done this, configure and make.
+ *
+ * windows '95 - I haven't tested this under '95, it will probably
+ * build but I know there are some limitations with cygwin under 95 so
+ * YMMV. I build with NT4 SP3.
+ *
+ * Andy Piper <andy@xemacs.org> 8/1/98 
+ * http://www.xemacs.freeserve.co.uk/ */
+
+#include "win32-common.h"
+
+/* Identify ourselves */
+#define CYGWIN
+
+/* We are using Cygwin-style headers in /usr/include, also used by MinGW */
+#define CYGWIN_HEADERS
+
+/* cheesy way to determine cygwin version */
+#ifndef NOT_C_CODE
+# include <signal.h>
+# include <cygwin/version.h>
+
+/* Still left out of 1.1! */
+double logb (double);
+int killpg (int pgrp, int sig);
+
+#endif
+
+#ifndef ORDINARY_LINK
+#define ORDINARY_LINK
+#endif
+
+#if __GNUC__ >= 3
+#define C_SWITCH_SYSTEM -fno-caller-saves
+#else
+#define C_SWITCH_SYSTEM -fno-caller-saves -fvtable-thunks
+#endif
+
+#define LIBS_SYSTEM -lwinmm
+#define WIN32_LEAN_AND_MEAN
+
+#define TEXT_START -1
+#define HEAP_IN_DATA
+#define NO_LIM_DATA
+
+#define BROKEN_SIGIO
+
+#define CYGWIN_BROKEN_SIGNALS
+
+#define strnicmp strncasecmp
+
+#undef MAIL_USE_SYSTEM_LOCK
+
+/* SYSTEM_TYPE should indicate the kind of system you are using.
+ It sets the Lisp variable system-type.  */
+
+#define SYSTEM_TYPE "cygwin32"
+
+/* Cygwin bogusly forgets to copy mmap()ed regions into the child when
+   a fork is done; thus, any reference to anything in mmap()ed space
+   (under PDUMP, in particular, this bites, since all data loaded from
+   PDUMP is normally done using mmap()) will cause an immediate segfault. */
+#undef HAVE_MMAP