When building for Mingw64 target on Fedora 22 a warning
is issued about _WIN32_WINNT being redefined.

In file included from ui/gtk.c:40:0:
include/ui/gtk.h:5:0: warning: "_WIN32_WINNT" redefined
 # define _WIN32_WINNT 0x0601 /* needed to get definition of MAPVK_VK_TO_VSC */
  ^
In file included from 
/usr/i686-w64-mingw32/sys-root/mingw/include/crtdefs.h:10:0,
                 from /usr/i686-w64-mingw32/sys-root/mingw/include/stdio.h:9,
                 from /home/berrange/src/virt/qemu/include/qemu/fprintf-fn.h:12,
                 from /home/berrange/src/virt/qemu/include/qemu-common.h:18,
                 from ui/gtk.c:37:
/usr/i686-w64-mingw32/sys-root/mingw/include/_mingw.h:225:0: note: this is the 
location of the previous definition
 #define _WIN32_WINNT 0x502
 ^

Signed-off-by: Daniel P. Berrange <berra...@redhat.com>
---
 include/ui/gtk.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/ui/gtk.h b/include/ui/gtk.h
index ee6dffd..7796231 100644
--- a/include/ui/gtk.h
+++ b/include/ui/gtk.h
@@ -2,7 +2,9 @@
 #define UI_GTK_H
 
 #ifdef _WIN32
-# define _WIN32_WINNT 0x0601 /* needed to get definition of MAPVK_VK_TO_VSC */
+# ifndef _WIN32_WINNT
+#  define _WIN32_WINNT 0x0601 /* needed to get definition of MAPVK_VK_TO_VSC */
+# endif
 #endif
 
 #ifdef CONFIG_PRAGMA_DIAGNOSTIC_AVAILABLE
-- 
2.4.3


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