build: == Dependency change ==  NFD now depends on ndn-cxx library

Change-Id: Ia9dd324a536573b5ac4fe1b73d82af772dc84923
Refs: #1536
diff --git a/.waf-tools/default-compiler-flags.py b/.waf-tools/default-compiler-flags.py
index 9f7843e..4e9548c 100644
--- a/.waf-tools/default-compiler-flags.py
+++ b/.waf-tools/default-compiler-flags.py
@@ -9,6 +9,8 @@
 def options(opt):
     opt.add_option('--debug', '--with-debug', action='store_true', default=False, dest='debug',
                    help='''Compile in debugging mode without all optimizations (-O0)''')
+    opt.add_option('--with-c++11', action='store_true', default=False, dest='use_cxx11',
+                   help='''Enable C++11 mode (experimental, may not work)''')
 
 def configure(conf):
     areCustomCxxflagsPresent = (len(conf.env.CXXFLAGS) > 0)