although the check for HAVE_STRUCT_TIMEVAL solved the redefine it is incorrect; lets see if a check for HAVE_GETTIMEOFDAY also works; if gettimeofday() is present then we can assume we have the timezone struct too.

nameser.h

@@ -32,7 +32,7 @@ struct iovec
 int ares_writev (SOCKET s, const struct iovec *vector, size_t count);
 #define writev(s,vect,count)  ares_writev(s,vect,count)
 
-#ifndef HAVE_STRUCT_TIMEVAL
+#ifndef HAVE_GETTIMEOFDAY
 struct timezone { int dummy; };
 #endif