--- ./src/util/snprintf.h.orig
+++ ./src/util/snprintf.h
@@ -12,10 +12,14 @@
 /* XXX: This is not quite the best place for it, perhaps. But do we have
  * a better one now? --pasky */
 #ifndef VA_COPY
+#ifdef va_copy
+#define VA_COPY va_copy
+#else
 #ifdef HAVE_VA_COPY
 #define VA_COPY(dest, src) __va_copy(dest, src)
 #else
 #define VA_COPY(dest, src) (dest) = (src)
+#endif
 #endif
 #endif