<div dir="ltr"><div><div>Dear all,<br><br></div>I have the below problem when I try to build the ndn-cxx, any idea why?<br><br>/ndn-cxx$ ./waf<br>Waf: Entering directory `/home/ubuntu/ndn-cxx/build'<br>Waf: Leaving directory `/home/ubuntu/ndn-cxx/build'<br>Traceback (most recent call last):<br>  File "/home/ubuntu/ndn-cxx/.waf-1.8.9-849024857bd41c3cf8e87dc01ecf79b0/waflib/Scripting.py", line 103, in waf_entry_point<br>    run_commands()<br>  File "/home/ubuntu/ndn-cxx/.waf-1.8.9-849024857bd41c3cf8e87dc01ecf79b0/waflib/Scripting.py", line 164, in run_commands<br>    ctx=run_command(cmd_name)<br>  File "/home/ubuntu/ndn-cxx/.waf-1.8.9-849024857bd41c3cf8e87dc01ecf79b0/waflib/Scripting.py", line 155, in run_command<br>    ctx.execute()<br>  File "/home/ubuntu/ndn-cxx/.waf-1.8.9-849024857bd41c3cf8e87dc01ecf79b0/waflib/Scripting.py", line 366, in execute<br>    return execute_method(self)<br>  File "/home/ubuntu/ndn-cxx/.waf-1.8.9-849024857bd41c3cf8e87dc01ecf79b0/waflib/Build.py", line 106, in execute<br>    self.execute_build()<br>  File "/home/ubuntu/ndn-cxx/.waf-1.8.9-849024857bd41c3cf8e87dc01ecf79b0/waflib/Build.py", line 113, in execute_build<br>    self.compile()<br>  File "/home/ubuntu/ndn-cxx/.waf-1.8.9-849024857bd41c3cf8e87dc01ecf79b0/waflib/Build.py", line 176, in compile<br>    self.producer.start()<br>  File "/home/ubuntu/ndn-cxx/.waf-1.8.9-849024857bd41c3cf8e87dc01ecf79b0/waflib/Runner.py", line 170, in start<br>    self.refill_task_list()<br>  File "/home/ubuntu/ndn-cxx/.waf-1.8.9-849024857bd41c3cf8e87dc01ecf79b0/waflib/Runner.py", line 98, in refill_task_list<br>    self.outstanding.extend(self.biter.next())<br>  File "/home/ubuntu/ndn-cxx/.waf-1.8.9-849024857bd41c3cf8e87dc01ecf79b0/waflib/Build.py", line 407, in get_build_iterator<br>    self.post_group()<br>  File "/home/ubuntu/ndn-cxx/.waf-1.8.9-849024857bd41c3cf8e87dc01ecf79b0/waflib/Build.py", line 391, in post_group<br>    f()<br>  File "/home/ubuntu/ndn-cxx/.waf-1.8.9-849024857bd41c3cf8e87dc01ecf79b0/waflib/TaskGen.py", line 110, in post<br>    v()<br>  File ".waf-tools/sphinx_build.py", line 60, in apply_sphinx<br>    confData = imp.load_source('sphinx_conf', conf.abspath())<br>  File "/home/ubuntu/ndn-cxx/docs/conf.py", line 47, in <module><br>    addExtensionIfExists('sphinxcontrib.doxylink')<br>  File "/home/ubuntu/ndn-cxx/docs/conf.py", line 39, in addExtensionIfExists<br>    __import__(extension)<br>  File "/usr/local/lib/python2.7/dist-packages/sphinxcontrib/doxylink/__init__.py", line 1, in <module><br>    from .doxylink import setup<br>  File "/usr/local/lib/python2.7/dist-packages/sphinxcontrib/doxylink/doxylink.py", line 170<br>    def find_url2(mapping, symbol: str) -> dict:<br>                                 ^<br>SyntaxError: invalid syntax<br><br></div><div>Thanks,</div><div>Mohammad<br></div></div>