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    Sometimes there are problems with sphinx/doxygen. It could be the
    case here. Try disabling/uninstalling both as it's only for the
    documentation as a quick fix. <br>
    <div class="moz-cite-prefix"><br>
      On 30/01/18 12:44, César A. Bernardini wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CAO9+PG_g8jEmYbd7BbuMc-fvAi7uuUe6Bhy_R9JjLoYT=Rrnew@mail.gmail.com">
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          <div>Unless I am not seeing something, it is a syntax problem
            of a python script.<br>
            <br>
          </div>
          Could you please try to install a different version of doxygen
          and try again?<br>
          <br>
        </div>
        You should update that ubuntu btw :)<br>
      </div>
      <div class="gmail_extra"><br>
        <div class="gmail_quote">2018-01-30 13:27 GMT+01:00 Giuseppe
          Carella <span dir="ltr"><<a
              href="mailto:gcarella228@gmail.com" target="_blank"
              moz-do-not-send="true">gcarella228@gmail.com</a>></span>:<br>
          <blockquote class="gmail_quote" style="margin:0 0 0
            .8ex;border-left:1px #ccc solid;padding-left:1ex">
            <div dir="ltr">
              <div>My Linux version is Ubuntu 14.04.5 LTS<span
                  class="HOEnZb"><font color="#888888"><br>
                    <br>
                  </font></span></div>
              <span class="HOEnZb"><font color="#888888">Giuseppe.<br>
                </font></span></div>
            <div class="HOEnZb">
              <div class="h5">
                <div class="gmail_extra"><br>
                  <div class="gmail_quote">2018-01-30 13:25 GMT+01:00
                    Giuseppe Carella <span dir="ltr"><<a
                        href="mailto:gcarella228@gmail.com"
                        target="_blank" moz-do-not-send="true">gcarella228@gmail.com</a>></span>:<br>
                    <blockquote class="gmail_quote" style="margin:0 0 0
                      .8ex;border-left:1px #ccc solid;padding-left:1ex">
                      <div dir="ltr">
                        <div>
                          <div>
                            <div>Good morning community,<br>
                              <br>
                            </div>
                            I am trying to install NFD, but each time I
                            execute "./waf" I get the following error:<br>
                            <br>
                            Traceback (most recent call last):<br>
                              File "/local/home/userlnx/Desktop/N<wbr>DN/NFD/.waf-1.8.9-8a9ccbc1c5d3<wbr>936b0b08e972e4883a9a/waflib/<wbr>Scripting.py",
                            line 103, in waf_entry_point<br>
                                run_commands()<br>
                              File "/local/home/userlnx/Desktop/N<wbr>DN/NFD/.waf-1.8.9-8a9ccbc1c5d3<wbr>936b0b08e972e4883a9a/waflib/<wbr>Scripting.py",
                            line 164, in run_commands<br>
                                ctx=run_command(cmd_name)<br>
                              File "/local/home/userlnx/Desktop/N<wbr>DN/NFD/.waf-1.8.9-8a9ccbc1c5d3<wbr>936b0b08e972e4883a9a/waflib/<wbr>Scripting.py",
                            line 155, in run_command<br>
                                ctx.execute()<br>
                              File "/local/home/userlnx/Desktop/N<wbr>DN/NFD/.waf-1.8.9-8a9ccbc1c5d3<wbr>936b0b08e972e4883a9a/waflib/<wbr>Scripting.py",
                            line 366, in execute<br>
                                return execute_method(self)<br>
                              File "/local/home/userlnx/Desktop/N<wbr>DN/NFD/.waf-1.8.9-8a9ccbc1c5d3<wbr>936b0b08e972e4883a9a/waflib/<wbr>Build.py",
                            line 106, in execute<br>
                                self.execute_build()<br>
                              File "/local/home/userlnx/Desktop/N<wbr>DN/NFD/.waf-1.8.9-8a9ccbc1c5d3<wbr>936b0b08e972e4883a9a/waflib/<wbr>Build.py",
                            line 113, in execute_build<br>
                                self.compile()<br>
                              File "/local/home/userlnx/Desktop/N<wbr>DN/NFD/.waf-1.8.9-8a9ccbc1c5d3<wbr>936b0b08e972e4883a9a/waflib/<wbr>Build.py",
                            line 176, in compile<br>
                                self.producer.start()<br>
                              File "/local/home/userlnx/Desktop/N<wbr>DN/NFD/.waf-1.8.9-8a9ccbc1c5d3<wbr>936b0b08e972e4883a9a/waflib/<wbr>Runner.py",
                            line 170, in start<br>
                                self.refill_task_list()<br>
                              File "/local/home/userlnx/Desktop/N<wbr>DN/NFD/.waf-1.8.9-8a9ccbc1c5d3<wbr>936b0b08e972e4883a9a/waflib/<wbr>Runner.py",
                            line 98, in refill_task_list<br>
                                self.outstanding.extend(self.b<wbr>iter.next())<br>
                              File "/local/home/userlnx/Desktop/N<wbr>DN/NFD/.waf-1.8.9-8a9ccbc1c5d3<wbr>936b0b08e972e4883a9a/waflib/<wbr>Build.py",
                            line 407, in get_build_iterator<br>
                                self.post_group()<br>
                              File "/local/home/userlnx/Desktop/N<wbr>DN/NFD/.waf-1.8.9-8a9ccbc1c5d3<wbr>936b0b08e972e4883a9a/waflib/<wbr>Build.py",
                            line 391, in post_group<br>
                                f()<br>
                              File "/local/home/userlnx/Desktop/N<wbr>DN/NFD/.waf-1.8.9-8a9ccbc1c5d3<wbr>936b0b08e972e4883a9a/waflib/<wbr>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 "/local/home/userlnx/Desktop/N<wbr>DN/NFD/docs/conf.py",
                            line 47, in <module><br>
                                addExtensionIfExists('sphinxco<wbr>ntrib.doxylink')<br>
                              File "/local/home/userlnx/Desktop/N<wbr>DN/NFD/docs/conf.py",
                            line 39, in addExtensionIfExists<br>
                                __import__(extension)<br>
                              File "/usr/local/lib/python2.7/dist<wbr>-packages/sphinxcontrib/doxyli<wbr>nk/__init__.py",
                            line 1, in <module><br>
                                from .doxylink import setup<br>
                              File "/usr/local/lib/python2.7/dist<wbr>-packages/sphinxcontrib/doxyli<wbr>nk/doxylink.py",
                            line 170<br>
                                def find_url2(mapping, symbol: str)
                            -> dict:<br>
                                                          <wbr>   ^<br>
                            SyntaxError: invalid syntax<br>
                            <br>
                            <br>
                          </div>
                          Thank you.<span
                            class="m_5640320779357970395HOEnZb"><font
                              color="#888888"><br>
                            </font></span></div>
                        <span class="m_5640320779357970395HOEnZb"><font
                            color="#888888">Giuseppe.<br>
                          </font></span></div>
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            <br>
            ______________________________<wbr>_________________<br>
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          </blockquote>
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