diff -r 895088452014 -r 08bfc3d9d2ae sources/mystring.h
--- a/sources/mystring.h	Tue May 26 18:19:27 2015 +0300
+++ b/sources/mystring.h	Tue May 26 18:46:24 2015 +0300
@@ -103,7 +103,8 @@
 	void replace (const char* a, const char* b);
 	void replace (int pos, int n, const String &a) { m_string.replace (pos, n, a.chars()); }
 	void shrink_to_fit() { m_string.shrink_to_fit(); }
-	void sprintf (const char* fmtstr, ...);
+	void __cdecl sprintf (const char* fmtstr, ...);
+	void vsprintf (const char* fmtstr, va_list args);
 	bool starts_with (const String &other);
 	String strip (char unwanted) { return strip ({unwanted}); }
 	String strip (const List<char> &unwanted);