diff -r 975c130c3901 -r d85d273cb3aa QTfrontend/ui/widget/feedbackdialog.cpp
--- a/QTfrontend/ui/widget/feedbackdialog.cpp	Tue May 03 22:19:17 2016 +0200
+++ b/QTfrontend/ui/widget/feedbackdialog.cpp	Wed May 04 14:09:54 2016 +0300
@@ -35,7 +35,9 @@
 #include <string>
 
 #ifdef Q_OS_WIN
+#ifndef WINVER
 #define WINVER 0x0500
+#endif
 #include <windows.h>
 #else
 #include <unistd.h>