@@ -469,10 +469,12 @@
 			AC_MSG_RESULT($exception_type)
 		], [
 			AC_MSG_RESULT(exceptions unavailable!)
 			AC_MSG_ERROR([Exceptions not accepted by compiler!])
 		])
+
+		AC_CHECK_FUNCS(_Unwind_GetDataRelBase _Unwind_GetTextRelBase)
 		;;
 	"Apple runtime")
 		AC_DEFINE(OF_APPLE_RUNTIME, 1,
 			[Whether we use the Apple ObjC runtime])
 
@@ -482,10 +484,12 @@
 		], [
 			AC_MSG_ERROR([libobjc not found!])
 		])
 		;;
 esac
+
+AC_CHECK_FUNCS(_Unwind_Backtrace)
 
 AC_CHECK_FUNC(objc_constructInstance, [], [
 	AC_SUBST(INSTANCE_M, "instance.m")
 ])