ndnSIM

I have this problem and I don't know how to solve

MacBook-Pro:~ Macpro$ ./waf configure --disable-python --enable-examples
Traceback (most recent call last):
File "/Users/Macpro/Documents/ndnSIM/ns-3/.waf-1.8.12-f00e5b53f6bbeab1384a38c9cc5d51f7/waflib/Scripting.py", line 108, in waf_entry_point
run_commands()
File "/Users/Macpro/Documents/ndnSIM/ns-3/.waf-1.8.12-f00e5b53f6bbeab1384a38c9cc5d51f7/waflib/Scripting.py", line 165, in run_commands
parse_options()
File "/Users/Macpro/Documents/ndnSIM/ns-3/.waf-1.8.12-f00e5b53f6bbeab1384a38c9cc5d51f7/waflib/Scripting.py", line 138, in parse_options
Context.create_context('options').execute()
File "/Users/Macpro/Documents/ndnSIM/ns-3/.waf-1.8.12-f00e5b53f6bbeab1384a38c9cc5d51f7/waflib/Options.py", line 146, in execute
super(OptionsContext,self).execute()
File "/Users/Macpro/Documents/ndnSIM/ns-3/.waf-1.8.12-f00e5b53f6bbeab1384a38c9cc5d51f7/waflib/Context.py", line 92, in execute
self.recurse([os.path.dirname(g_module.root_path)])
File "/Users/Macpro/Documents/ndnSIM/ns-3/.waf-1.8.12-f00e5b53f6bbeab1384a38c9cc5d51f7/waflib/Context.py", line 133, in recurse
user_function(self)
File "/Users/Macpro/Documents/ndnSIM/ns-3/wscript", line 213, in options
opt.recurse('src')
File "/Users/Macpro/Documents/ndnSIM/ns-3/.waf-1.8.12-f00e5b53f6bbeab1384a38c9cc5d51f7/waflib/Context.py", line 133, in recurse
user_function(self)
File "/Users/Macpro/Documents/ndnSIM/ns-3/src/wscript", line 48, in options
opt.recurse(module, mandatory=False)
File "/Users/Macpro/Documents/ndnSIM/ns-3/.waf-1.8.12-f00e5b53f6bbeab1384a38c9cc5d51f7/waflib/Context.py", line 133, in recurse
user_function(self)
File "/Users/Macpro/Documents/ndnSIM/ns-3/src/ndnSIM/wscript", line 18, in options
tooldir=['%s/ndn-cxx/.waf-tools' % opt.path.abspath()])
File "/Users/Macpro/Documents/ndnSIM/ns-3/.waf-1.8.12-f00e5b53f6bbeab1384a38c9cc5d51f7/waflib/Context.py", line 86, in load
module=load_tool(t,path)
File "/Users/Macpro/Documents/ndnSIM/ns-3/.waf-1.8.12-f00e5b53f6bbeab1384a38c9cc5d51f7/waflib/Context.py", line 342, in load_tool
import(tool)
ImportError: No module named doxygen