Index: configure.ac
==================================================================
--- configure.ac
+++ configure.ac
@@ -121,11 +121,11 @@
 AS_IF([test x"$ac_cv_header_objc_objc_h" = x"yes"], [
 	dnl Only accept it if it's from gcc >= 4.7, as the one in 4.6 is buggy
 	dnl when using the new API.
 	AC_EGREP_CPP(yes, [
 		#import <objc/objc.h>
-		#ifdef __GNU_LIBOBJC__ >= 20110608
+		#if defined(__GNU_LIBOBJC__) && __GNU_LIBOBJC__ >= 20110608
 		yes
 		#endif
 	], [
 		test x"$objc_runtime" = x"" && objc_runtime="GNU"
 	], [