commit f6fdadce0e8362d8ccaf0bdf024e1d9ac73afeaa
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri May 1 22:22:19 2015 +0100

    	* include/experimental/memory: Correct feature-test macro.

diff --git a/libstdc++-v3/include/experimental/memory b/libstdc++-v3/include/experimental/memory
index f43621f..08a6b33 100644
--- a/libstdc++-v3/include/experimental/memory
+++ b/libstdc++-v3/include/experimental/memory
@@ -52,7 +52,7 @@ inline namespace fundamentals_v2
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
-#define __cpp_lib_experimental_not_fn 201411
+#define __cpp_lib_experimental_observer_ptr 201411
 
   template <typename _Tp>
     class observer_ptr