Using pip 21.3.1 from /home/jjerphan/.local/share/miniconda3/envs/kdtree/lib/python3.9/site-packages/pip (python 3.9)
Obtaining file:///home/jjerphan/dev/kdtree
  Running command python setup.py egg_info

  Error compiling Cython file:
  ------------------------------------------------------------
  ...
              # the asynchronous construction of the tree.
              active Counter counter = consume Counter()
              active QueryActor query_actor

          for idx_worker in range(n_workers):
              query_actor = consume QueryActor(
                                             ^
  ------------------------------------------------------------

  kdtree.pyx:785:44: Call with wrong number of arguments (expected 0, got 11)
  Traceback (most recent call last):
    File "<string>", line 1, in <module>
    File "/home/jjerphan/dev/kdtree/setup.py", line 20, in <module>
      ext_modules=cythonize(extensions),
    File "/home/jjerphan/dev/kdtree/src/cython/Cython/Build/Dependencies.py", line 1110, in cythonize
      cythonize_one(*args)
    File "/home/jjerphan/dev/kdtree/src/cython/Cython/Build/Dependencies.py", line 1277, in cythonize_one
      raise CompileError(None, pyx_file)
  Cython.Compiler.Errors.CompileError: kdtree.pyx
  Compiling kdtree.pyx because it changed.
  [1/1] Cythonizing kdtree.pyx
  Preparing metadata (setup.py) ... error