pip install cyipopt error

[GaoLon]

Excellent work! When installing pkgs in requirements.txt, I got following error:

(rdf) ➜ RDF pip install -i https://pypi.tuna.tsinghua.edu.cn/simple/ -r requirements.txt
Looking in indexes: https://pypi.tuna.tsinghua.edu.cn/simple/
Collecting cyipopt==1.2.0 (from -r requirements.txt (line 1))
Downloading https://pypi.tuna.tsinghua.edu.cn/packages/4c/34/180b14dc521ae6a393c98d74d59afc79a7edc19a18721b69571843bfc495/cyipopt-1.2.0.tar.gz (46 kB)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 46.4/46.4 kB 549.6 kB/s eta 0:00:00
Preparing metadata (setup.py) ... error
error: subprocess-exited-with-error

× python setup.py egg_info did not run successfully.
│ exit code: 1
╰─> [41 lines of output]
ERROR: Could not find a version that satisfies the requirement cython>=0.26 (from versions: none)
ERROR: No matching distribution found for cython>=0.26
/tmp/pip-install-p4_rrps6/cyipopt_f7db36761fa84ed88120fe6fc01ac0fc/setup.py:26: _DeprecatedInstaller: setuptools.installer and fetch_build_eggs are deprecated.
!!

          ********************************************************************************
          Requirements should be satisfied by a PEP 517 installer.
          If you are using pip, you can try `pip install --use-pep517`.
          ********************************************************************************
  
  !!
    dist.Distribution().fetch_build_eggs(SETUP_REQUIRES)
  Traceback (most recent call last):
    File "/home/wt/anaconda3/envs/rdf/lib/python3.8/site-packages/setuptools/installer.py", line 101, in _fetch_build_egg_no_warn
      subprocess.check_call(cmd)
    File "/home/wt/anaconda3/envs/rdf/lib/python3.8/subprocess.py", line 364, in check_call
      raise CalledProcessError(retcode, cmd)
  subprocess.CalledProcessError: Command '['/home/wt/anaconda3/envs/rdf/bin/python', '-m', 'pip', '--disable-pip-version-check', 'wheel', '--no-deps', '-w', '/tmp/tmpnw438pev', '--quiet', 'cython>=0.26']' returned non-zero exit status 1.
  
  The above exception was the direct cause of the following exception:
  
  Traceback (most recent call last):
    File "<string>", line 2, in <module>
    File "<pip-setuptools-caller>", line 34, in <module>
    File "/tmp/pip-install-p4_rrps6/cyipopt_f7db36761fa84ed88120fe6fc01ac0fc/setup.py", line 26, in <module>
      dist.Distribution().fetch_build_eggs(SETUP_REQUIRES)
    File "/home/wt/anaconda3/envs/rdf/lib/python3.8/site-packages/setuptools/dist.py", line 662, in fetch_build_eggs
      return _fetch_build_eggs(self, requires)
    File "/home/wt/anaconda3/envs/rdf/lib/python3.8/site-packages/setuptools/installer.py", line 38, in _fetch_build_eggs
      resolved_dists = pkg_resources.working_set.resolve(
    File "/home/wt/anaconda3/envs/rdf/lib/python3.8/site-packages/pkg_resources/__init__.py", line 829, in resolve
      dist = self._resolve_dist(
    File "/home/wt/anaconda3/envs/rdf/lib/python3.8/site-packages/pkg_resources/__init__.py", line 865, in _resolve_dist
      dist = best[req.key] = env.best_match(
    File "/home/wt/anaconda3/envs/rdf/lib/python3.8/site-packages/pkg_resources/__init__.py", line 1135, in best_match
      return self.obtain(req, installer)
    File "/home/wt/anaconda3/envs/rdf/lib/python3.8/site-packages/pkg_resources/__init__.py", line 1147, in obtain
      return installer(requirement)
    File "/home/wt/anaconda3/envs/rdf/lib/python3.8/site-packages/setuptools/installer.py", line 103, in _fetch_build_egg_no_warn
      raise DistutilsError(str(e)) from e
  distutils.errors.DistutilsError: Command '['/home/wt/anaconda3/envs/rdf/bin/python', '-m', 'pip', '--disable-pip-version-check', 'wheel', '--no-deps', '-w', '/tmp/tmpnw438pev', '--quiet', 'cython>=0.26']' returned non-zero exit status 1.
  [end of output]

note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed

× Encountered error while generating package metadata.
╰─> See above for output.

note: This is an issue with the package mentioned above, not pip.
hint: See above for details.