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Written-by: Mark Andrews <Mark_Andrews isc org> (upstream)
Reviewed-by: Adam Tkac <atkac redhat com>

diff -up bind-9.5.0a6/lib/bind/resolv/res_data.c._res_errno bind-9.5.0a6/lib/bind/resolv/res_data.c
--- bind-9.5.0a6/lib/bind/resolv/res_data.c._res_errno	2007-09-06 09:26:29.000000000 +0200
+++ bind-9.5.0a6/lib/bind/resolv/res_data.c	2007-09-06 09:28:14.000000000 +0200
@@ -40,7 +40,6 @@ static const char rcsid[] = "$Id: res_da
 #include <unistd.h>
 
 #include "port_after.h"
-#undef _res
 
 const char *_res_opcodes[] = {
 	"QUERY",
@@ -70,6 +69,7 @@ const char *_res_sectioncodes[] = {
 };
 #endif
 
+#undef _res
 #ifndef __BIND_NOSTATIC
 struct __res_state _res
 # if defined(__BIND_RES_TEXT)
@@ -77,6 +77,10 @@ struct __res_state _res
 # endif
         ;
 
+#if defined(DO_PTHREADS) || defined(__linux)
+#define _res (*__res_state())
+#endif
+
 /* Proto. */
 
 int  res_ourserver_p(const res_state, const struct sockaddr_in *);