
try the following:

  # make
  # ln -s Makefile link_target
  # ./navigating_a_namespace


You should end up with something like:

  #  ~.../10_-_using_the_namespace_package : ./navigating_a_namespace 
  .depend/
  link_target -> Makefile
  Makefile
  navigating_a_namespace
  navigating_a_namespace.cpp
  navigating_a_namespace.o
  README

