[Ndn-interest] "SyntaxError: invalid syntax" when installing NFD

[Jin Yang]

Hi， everyone,
I had trouble installing NFD. To install it，I compiled from source and followed the steps in http://named-data.net/doc/NFD/current/INSTALL.html 
When coming to the “Build” step，I entered “./waf” but meet the following error.
I successfully installed the version 0.5.1 last year. Recent version is 0.6.1 but installed unsuccessfully. What‘s more, if I git clone the version 0.5.1, same error information appeared.
My environment is a completely new Ubuntu virtual machine.


tan at tan-desktop:~/ndnndnndn/ndn-cxx$ ./waf Waf: Entering directory `/home/tan/ndnndnndn/ndn-cxx/build' Waf: Leaving directory `/home/tan/ndnndnndn/ndn-cxx/build' Traceback (most recent call last):   File "/home/tan/ndnndnndn/ndn-cxx/.waf-1.8.9-849024857bd41c3cf8e87dc01ecf79b0/waflib/Scripting.py", line 103, in waf_entry_point     run_commands()   File "/home/tan/ndnndnndn/ndn-cxx/.waf-1.8.9-849024857bd41c3cf8e87dc01ecf79b0/waflib/Scripting.py", line 164, in run_commands     ctx=run_command(cmd_name)   File "/home/tan/ndnndnndn/ndn-cxx/.waf-1.8.9-849024857bd41c3cf8e87dc01ecf79b0/waflib/Scripting.py", line 155, in run_command     ctx.execute()   File "/home/tan/ndnndnndn/ndn-cxx/.waf-1.8.9-849024857bd41c3cf8e87dc01ecf79b0/waflib/Scripting.py", line 366, in execute     return execute_method(self)   File "/home/tan/ndnndnndn/ndn-cxx/.waf-1.8.9-849024857bd41c3cf8e87dc01ecf79b0/waflib/Build.py", line 106, in execute     self.execute_build()   File "/home/tan/ndnndnndn/ndn-cxx/.waf-1.8.9-849024857bd41c3cf8e87dc01ecf79b0/waflib/Build.py", line 113, in execute_build     self.compile()   File "/home/tan/ndnndnndn/ndn-cxx/.waf-1.8.9-849024857bd41c3cf8e87dc01ecf79b0/waflib/Build.py", line 176, in compile     self.producer.start()   File "/home/tan/ndnndnndn/ndn-cxx/.waf-1.8.9-849024857bd41c3cf8e87dc01ecf79b0/waflib/Runner.py", line 170, in start     self.refill_task_list()   File "/home/tan/ndnndnndn/ndn-cxx/.waf-1.8.9-849024857bd41c3cf8e87dc01ecf79b0/waflib/Runner.py", line 98, in refill_task_list     self.outstanding.extend(self.biter.next())   File "/home/tan/ndnndnndn/ndn-cxx/.waf-1.8.9-849024857bd41c3cf8e87dc01ecf79b0/waflib/Build.py", line 407, in get_build_iterator     self.post_group()   File "/home/tan/ndnndnndn/ndn-cxx/.waf-1.8.9-849024857bd41c3cf8e87dc01ecf79b0/waflib/Build.py", line 391, in post_group     f()   File "/home/tan/ndnndnndn/ndn-cxx/.waf-1.8.9-849024857bd41c3cf8e87dc01ecf79b0/waflib/TaskGen.py", line 110, in post     v()   File ".waf-tools/sphinx_build.py", line 60, in apply_sphinx     confData = imp.load_source('sphinx_conf', conf.abspath())   File "/home/tan/ndnndnndn/ndn-cxx/docs/conf.py", line 47, in <module>     addExtensionIfExists('sphinxcontrib.doxylink')   File "/home/tan/ndnndnndn/ndn-cxx/docs/conf.py", line 39, in addExtensionIfExists     __import__(extension)   File "/home/tan/.local/lib/python2.7/site-packages/sphinxcontrib/doxylink/__init__.py", line 1, in <module>     from .doxylink import setup   File "/home/tan/.local/lib/python2.7/site-packages/sphinxcontrib/doxylink/doxylink.py", line 170     def find_url2(mapping, symbol: str) -> dict:                                  ^ SyntaxError: invalid syntaxtan at tan-desktop:~/ndnndnndn/ndn-cxx$ 
Can someone guide me on this. Thank you in advance.
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