update README.windows to include mingw info.

ChangeLog

@@ -12,6 +12,8 @@
 	Add back the useful --disable-dynamic and
 	--disable-preload that appear to have been removed
 	at some point but are documented in README.
+	* README.windows: Update info to include mingw
+	references.
 
 2011-11-07 Chris Bagwell <chris at cnpbagwell dot com>
 	* ltmain.sh: Disable sane's soname libtool hack for

README.windows

@@ -1,13 +1,16 @@
-SANE on Cygwin/Win32
+SANE on Windows
 
 Prerequisites
 =============
 
-To be able to compile sane-backends, you need to have Cygwin installed,
-with at least the following package(s):
-  - gcc
+To be able to compile sane-backends, you need to have either Cygwin
+or Mingw compilers and a suitable POSIX compatible environment.
 
-You can get Cygwin at http://sources.redhat.com/cygwin/
+You can get the Cygwin POSIX compatible environment for Windows
+Windows and the Cygwin gcc compiler at http://www.cygwin.com
+
+You can get the MSYS POSIX compatible environment for Windows and the
+MinGW gcc compiler at http://www.mingw.org/wiki/MSYS
 
 The scanner must be detected by Windows and not be disabled. Check
 with the hardware manager.
@@ -16,44 +19,47 @@ with the hardware manager.
 Building
 ========
 
-See general README for build basics. The autoconf script (configure) checks
-for C++ compilers and misdetects CC (=cc = gcc) a a c++ compiler because of
-the case-insensitive filesystem. If that happens, one work-around will be to
-install a real C++ compiler.
+See general README for build basics. If a given backend fails to
+compile, you can use the BACKENDS variable to limit compilation
+to backends your interested in:
+
+  ./configure BACKENDS=epson2
 
 
-Scanning
-========
+Configuring
+===========
 
 If you have more than one scanner, you should do the following:
 
   - run sane-find-scanner to get the device name of the scanner. The
-    name is something like h0b0t6l0, meaning hba 0, bus 0, scsi id 6 and
-    lun 0.
+    name for scsi devices is something like h0b0t6l0, meaning hba 0, bus 0,
+    scsi id 6 and lun 0.
 
   - edit the config file for the backend
-    (/usr/local/etc/sane.d/xxxx.conf) and add the scanner device name on
+    (/path/to/sane/etc/sane.d/xxxx.conf) and add the scanner device name on
     an empty line.
 
+  - Set environment variable SANE_CONFIG_DIR to point to the directory
+    where the config files are located.
+
 Run "scanimage > out.pnm" to get a scan.
 
-xscanimage and XSane also work. xscanimage compiles and runs out of
-the box. XSane 0.92 needs a couple build fixes.
-
+xscanimage ans XSane have been reported to compile and run in the past
+under Cygwin.
 
 Notes
 =====
 
-- Only SCSI and USB (with libusb-win32) scanners may work. No
-  FireWire/Parallel. The Cygwin libusb port is at
-  http://sourceforge.net/projects/libusb-win32.
+- Only SCSI, USB (with libusb-win32), and network scanners may work. No
+  FireWire/Parallel. The Cygwin libusb port can be installed
+  with Cygwin setup.exe or can be compiled manually under cygwin
+  or mingw using the libusb-win32 port:
+  http://sourceforge.net/apps/trac/libusb-win32/wiki
 
-- Tested on Windows 2000 only. Should work on Windows NT/XP too;
-  may or may not work on Windows 95/98/ME.
+- Tested on Windows XP, 7, and using Wine on Linux.
 
 - Some scanners' backend may not work because of requirement not
-  supported by Cygwin.
+  supported by Cygwin or MinGW.
 
 
-2004/02/07
-Frank Zago.
+2011/10/08