diff --git a/src/mrw/checkcxx11.hxx b/src/mrw/checkcxx11.hxx
index 95c9bb3..d6fed5e 100644
--- a/src/mrw/checkcxx11.hxx
+++ b/src/mrw/checkcxx11.hxx
@@ -68,14 +68,19 @@ namespace std {
 };
 #    endif
 #  elsif __APPLE__
+#    warning you need a C++11 compliant compiler, on gcc: add -std=c++11
+#    warning emulating C++11 - this changes the way you use the library
+#    warning this is deprecated and will be removed in future releases
+#    warning refere to the library documentation for more details
+#    warning special workaround for apple
 #    include <tr1/memory>
      namespace std {
        // there is no std::shared_ptr in apple, but
        // std::tr1::shared_ptr in <tr1/memory>
        template <typename T> class shared_ptr: public tr1::shared_ptr<T> {
          public:
-           explicit shared_ptr(): boost::shared_ptr<T>() {}
-           explicit shared_ptr(T* p): boost::shared_ptr<T>(p) {}
+           explicit shared_ptr(): tr1::shared_ptr<T>() {}
+           explicit shared_ptr(T* p): tr1::shared_ptr<T>(p) {}
        };
      }
 #  endif