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    <p>Dear Rajdeep,</p>
    <p>It seems that the update of setuptools happened with python 2
      instead of 3. You can force pip to use a specific Python
      interpreter by calling it as 'python -m pip' instead of simply
      calling 'pip', where 'python' should be the specific interpreter
      that you want to install something on.</p>
    <p>So in this case, you can try:</p>
    <tt>sudo python3 -m pip install -U setuptools</tt><br>
    <tt>python3 -m pip install --user PATH_TO_Z2PACK</tt>
    <p>Best regards,</p>
    <p>Dominik<br>
    </p>
    <br>
    <div class="moz-cite-prefix">On 16.04.2018 06:42, Rajdeep Banerjee
      wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CA+YfB7T8ZMYWeQK5bWQMgjF7Ht=p5Vx8rJc7SzoyeoOaYHQGEQ@mail.gmail.com">
      <div dir="ltr">
        <div>
          <div>Dear sir,<br>
          </div>
                      I tried following your suggestion and found the
          following:<br>
          >> sudo pip install -U setuptools <br>
          Requirement already up-to-date: setuptools in
          /usr/local/lib/python2.7/dist-packages<br>
          Cleaning up...<br>
          <br>
        </div>
        It seems although I have installed python-3.5, but my default is
        python-2.7. I changed the alias in bash so that calling python
        will call python-3.5. But the problem persists.<br>
        >> sudo python -m pip install --user
        /home/rajdeep/soft/Z2Pack-master-2.1.x<br>
        <br>
        ...<br>
        <br>
        <div>Downloading/unpacking fsc.export (from z2pack==2.1.1)<br>
            Downloading fsc.export-1.1.0.tar.gz<br>
            Running setup.py
          (path:/tmp/pip_build_rajdeep/fsc.export/setup.py) egg_info for
          package fsc.export<br>
              error in fsc.export setup command: Invalid environment
          marker: python_version < "3"<br>
              Complete output from command python setup.py egg_info:<br>
              error in fsc.export setup command: Invalid environment
          marker: python_version < "3"<br>
          <br>
          <br>
        </div>
        <div>Please help. Thanks in advance.<br>
          <br>
        </div>
        <div>best regards,<br>
        </div>
        <div>Rajdeep<br>
        </div>
        <div><br>
          <br>
          <br>
        </div>
      </div>
      <div class="gmail_extra"><br>
        <div class="gmail_quote">On Sat, Apr 14, 2018 at 10:34 PM,
          Rajdeep Banerjee <span dir="ltr"><<a
              href="mailto:rajdeep.jzs@gmail.com" target="_blank"
              moz-do-not-send="true">rajdeep.jzs@gmail.com</a>></span>
          wrote:<br>
          <blockquote class="gmail_quote" style="margin:0 0 0
            .8ex;border-left:1px #ccc solid;padding-left:1ex">
            <div dir="auto">Dear sir,
              <div dir="auto">              thank you very much for your
                suggestion, I will let you know if it works.</div>
              <div dir="auto"><br>
              </div>
              <div dir="auto">best regards,</div>
              <div dir="auto">Rajdeep</div>
              <div dir="auto"><br>
              </div>
              <div dir="auto"><br>
              </div>
            </div>
            <div class="HOEnZb">
              <div class="h5"><br>
                <div class="gmail_quote">
                  <div dir="ltr">On Sat, Apr 14, 2018, 8:57 PM Dominik
                    Gresch <<a href="mailto:greschd@phys.ethz.ch"
                      target="_blank" moz-do-not-send="true">greschd@phys.ethz.ch</a>>
                    wrote:<br>
                  </div>
                  <blockquote class="gmail_quote" style="margin:0 0 0
                    .8ex;border-left:1px #ccc solid;padding-left:1ex">
                    <div dir="auto">Hi Rajdeep,
                      <div dir="auto"><br>
                      </div>
                      <div dir="auto">I think this issue might be due to
                        an outdated version of the 'setuptools' package
                        which does not recognize these environment
                        markers.</div>
                      <div dir="auto"><br>
                      </div>
                      <div dir="auto">Can you try running </div>
                      <div dir="auto"><br>
                      </div>
                      <div dir="auto">'pip install -U setuptools'</div>
                      <div dir="auto"><br>
                      </div>
                      <div dir="auto">before installing Z2Pack?</div>
                      <div dir="auto"><br>
                      </div>
                      <div dir="auto">Best regards,</div>
                      <div dir="auto">Dominik</div>
                    </div>
                    <div class="gmail_extra"><br>
                      <div class="gmail_quote">Am 14.04.2018 08:23
                        schrieb Rajdeep Banerjee <<a
                          href="mailto:rajdeep.jzs@gmail.com"
                          rel="noreferrer" target="_blank"
                          moz-do-not-send="true">rajdeep.jzs@gmail.com</a>>:<br
                          type="attribution">
                        <blockquote
                          class="m_-7351190661425051621m_-1923250587986364406quote"
                          style="margin:0 0 0 .8ex;border-left:1px #ccc
                          solid;padding-left:1ex">
                          <div dir="ltr">
                            <div>
                              <div>Hi,<br>
                              </div>
                                 I am trying to install Z2Pack 2.1.1
                              (from source file). I am getting the
                              following error:<br>
                              <br>
                              Downloading/unpacking fsc.export (from
                              z2pack==2.1.1)<br>
                                Downloading fsc.export-1.1.0.tar.gz<br>
                                Running setup.py
                              (path:/tmp/pip_build_rajdeep/<wbr>fsc.export/setup.py)
                              egg_info for package fsc.export<br>
                                  error in fsc.export setup command:
                              Invalid environment marker: python_version
                              < "3"<br>
                                  Complete output from command python
                              setup.py egg_info:<br>
                                  error in fsc.export setup command:
                              Invalid environment marker: python_version
                              < "3"<br>
                              <br>
                              ------------------------------<wbr>----------<br>
                              Cleaning up...<br>
                              Command python setup.py egg_info failed
                              with error code 1 in
                              /tmp/pip_build_rajdeep/fsc.<wbr>export<br>
                              Storing debug log for failure in
                              /tmp/tmp3bth1l3g<br>
                              <br>
                              <br>
                            </div>
                            I thought it is due to python version but I
                            have python 3.5 as shown below:<br>
                            <div><br>
                              <br>
                              [rajdeep@anna: Z2Pack-master-2.1.x]:python<br>
                              Python 3.5.3 (default, Apr 22 2017,
                              00:00:00) <br>
                              [GCC 4.8.4] on linux<br>
                              Type "help", "copyright", "credits" or
                              "license" for more information.<br>
                              >>> <br>
                              <br>
                            </div>
                            <div>Please help. Thanks in advance!<br>
                            </div>
                            <div><br>
                              <br clear="all">
                              <div>
                                <div>best regards,<br>
                                </div>
                                <div>-- <br>
                                  <div>
                                    <div dir="ltr">Rajdeep Banerjee<br>
                                      PhD student
                                      <div>JNCASR, Bangalore</div>
                                      <div>India</div>
                                    </div>
                                  </div>
                                </div>
                              </div>
                            </div>
                          </div>
                        </blockquote>
                      </div>
                      <br>
                    </div>
                  </blockquote>
                </div>
              </div>
            </div>
          </blockquote>
        </div>
        <br>
        <br clear="all">
        <br>
        -- <br>
        <div class="gmail_signature" data-smartmail="gmail_signature">
          <div dir="ltr">Rajdeep Banerjee<br>
            PhD student
            <div>JNCASR, Bangalore</div>
            <div>India</div>
          </div>
        </div>
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