make: In ndn-cpp-config.h, to avoid polluting the global name space, generate NDN_CPP_HAVE_BOOST_FUNCTION etc. instead of HAVE_BOOST_FUNCTION, etc.
diff --git a/ndn-cpp/util/logging.cpp b/ndn-cpp/util/logging.cpp
index 1ea8667..7147768 100644
--- a/ndn-cpp/util/logging.cpp
+++ b/ndn-cpp/util/logging.cpp
@@ -8,7 +8,7 @@
 
 #include "logging.hpp"
 
-#ifdef HAVE_LOG4CXX
+#ifdef NDN_CPP_HAVE_LOG4CXX
 
 #include <log4cxx/logger.h>
 #include <log4cxx/basicconfigurator.h>