--- a/xmlwriter.c	2014-10-03 15:28:06.000000000 +0400
+++ b/xmlwriter.c	2014-11-19 21:21:29.817274759 +0300
@@ -35,19 +35,13 @@
  * be sufficient for libxml2.
  */
 #ifndef VA_COPY
-  #ifdef HAVE_VA_COPY
+  #ifndef _WIN32
+    #ifndef va_copy
+        #define va_copy __va_copy
+    #endif
     #define VA_COPY(dest, src) va_copy(dest, src)
   #else
-    #ifdef HAVE___VA_COPY
-      #define VA_COPY(dest,src) __va_copy(dest, src)
-    #else
-      #ifndef VA_LIST_IS_ARRAY
-        #define VA_COPY(dest,src) (dest) = (src)
-      #else
-        #include <string.h>
-        #define VA_COPY(dest,src) memcpy((char *)(dest),(char *)(src),sizeof(va_list))
-      #endif
-    #endif
+    #define VA_COPY(dest,src) (dest) = (src)
   #endif
 #endif