installing pyfasttext seems to require cysignals?

[Styrke]

I tried to install pyfasttext from pip but had the following error:

styrke@laptop ~/code $ pip install pyfasttext
Collecting pyfasttext
  Using cached pyfasttext-0.4.0.tar.gz
    Complete output from command python setup.py egg_info:
    
    Error compiling Cython file:
    ------------------------------------------------------------
    ...
    from libcpp.map cimport map
    from libcpp.set cimport set
    from libcpp.utility cimport pair
    from libcpp.queue cimport priority_queue
    
    from cysignals.signals cimport sig_on, sig_off, sig_check
    ^
    ------------------------------------------------------------
    
    src/pyfasttext.pyx:20:0: 'cysignals/signals.pxd' not found
    
    Error compiling Cython file:
    ------------------------------------------------------------
    ...
    from libcpp.map cimport map
    from libcpp.set cimport set
    from libcpp.utility cimport pair
    from libcpp.queue cimport priority_queue
    
    from cysignals.signals cimport sig_on, sig_off, sig_check
    ^
    ------------------------------------------------------------
    
    src/pyfasttext.pyx:20:0: 'cysignals/signals/sig_on.pxd' not found
    
    Error compiling Cython file:
    ------------------------------------------------------------
    ...
    from libcpp.map cimport map
    from libcpp.set cimport set
    from libcpp.utility cimport pair
    from libcpp.queue cimport priority_queue
    
    from cysignals.signals cimport sig_on, sig_off, sig_check
    ^
    ------------------------------------------------------------
    
    src/pyfasttext.pyx:20:0: 'cysignals/signals/sig_off.pxd' not found
    
    Error compiling Cython file:
    ------------------------------------------------------------
    ...
    from libcpp.map cimport map
    from libcpp.set cimport set
    from libcpp.utility cimport pair
    from libcpp.queue cimport priority_queue
    
    from cysignals.signals cimport sig_on, sig_off, sig_check
    ^
    ------------------------------------------------------------
    
    src/pyfasttext.pyx:20:0: 'cysignals/signals/sig_check.pxd' not found
    
    Error compiling Cython file:
    ------------------------------------------------------------
    ...
    
        dict = self.ft.getDictionary()
        self.word_vectors = make_unique[Matrix](deref(dict).nwords(), self.ft.getDimension())
        deref(self.word_vectors).zero()
        for i in range(deref(dict).nwords()):
          sig_check()
         ^
    ------------------------------------------------------------
    
    src/pyfasttext.pyx:302:6: 'sig_check' is not a constant, variable or function identifier
    
    Error compiling Cython file:
    ------------------------------------------------------------
    ...
        query_norm = query_vec.norm()
        if abs(query_norm) < 1e-8:
          query_norm = 1.0
        dict = self.ft.getDictionary()
        for idx in range(deref(dict).nwords()):
          sig_check()
         ^
    ------------------------------------------------------------
    
    src/pyfasttext.pyx:346:6: 'sig_check' is not a constant, variable or function identifier
    
    Error compiling Cython file:
    ------------------------------------------------------------
    ...
          word = deref(dict).getWord(idx)
          dp = deref(self.word_vectors).dotRow(query_vec, idx)
          heap.push(pair[real, string](dp / query_norm, word))
    
        while i < k and heap.size() > 0:
          sig_check()
         ^
    ------------------------------------------------------------
    
    src/pyfasttext.pyx:352:6: 'sig_check' is not a constant, variable or function identifier
    
    Error compiling Cython file:
    ------------------------------------------------------------
    ...
        cdef shared_ptr[Args] s_args = make_shared[Args]()
    
        deref(s_args).parseArgs(args)
        try:
          if command == 'quantize':
            sig_on()
           ^
    ------------------------------------------------------------
    
    src/pyfasttext.pyx:461:8: 'sig_on' is not a constant, variable or function identifier
    
    Error compiling Cython file:
    ------------------------------------------------------------
    ...
        deref(s_args).parseArgs(args)
        try:
          if command == 'quantize':
            sig_on()
            self.ft.quantize(s_args)
            sig_off()
           ^
    ------------------------------------------------------------
    
    src/pyfasttext.pyx:463:8: 'sig_off' is not a constant, variable or function identifier
    
    Error compiling Cython file:
    ------------------------------------------------------------
    ...
          if command == 'quantize':
            sig_on()
            self.ft.quantize(s_args)
            sig_off()
          else:
            sig_on()
           ^
    ------------------------------------------------------------
    
    src/pyfasttext.pyx:465:8: 'sig_on' is not a constant, variable or function identifier
    
    Error compiling Cython file:
    ------------------------------------------------------------
    ...
            self.ft.quantize(s_args)
            sig_off()
          else:
            sig_on()
            self.ft.train(s_args)
            sig_off()
           ^
    ------------------------------------------------------------
    
    src/pyfasttext.pyx:467:8: 'sig_off' is not a constant, variable or function identifier
    
    Error compiling Cython file:
    ------------------------------------------------------------
    ...
    
        predictions = []
        for line in lines:
          line = bytes(line, self.encoding)
          deref(iss).str(line)
          sig_on()
         ^
    ------------------------------------------------------------
    
    src/pyfasttext.pyx:546:6: 'sig_on' is not a constant, variable or function identifier
    
    Error compiling Cython file:
    ------------------------------------------------------------
    ...
        for line in lines:
          line = bytes(line, self.encoding)
          deref(iss).str(line)
          sig_on()
          self.ft.predict(deref(iss), k, c_predictions)
          sig_off()
         ^
    ------------------------------------------------------------
    
    src/pyfasttext.pyx:548:6: 'sig_off' is not a constant, variable or function identifier
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-build-ottj3fbr/pyfasttext/setup.py", line 58, in <module>
        ext_modules=cythonize(extension, compile_time_env={'USE_NUMPY': USE_NUMPY}),
      File "/home/styrke/miniconda3/lib/python3.6/site-packages/Cython/Build/Dependencies.py", line 1039, in cythonize
        cythonize_one(*args)
      File "/home/styrke/miniconda3/lib/python3.6/site-packages/Cython/Build/Dependencies.py", line 1161, in cythonize_one
        raise CompileError(None, pyx_file)
    Cython.Compiler.Errors.CompileError: src/pyfasttext.pyx
    src/pyfasttext.pyx: cannot find cimported module 'cysignals.signals'
    Compiling src/pyfasttext.pyx because it depends on /home/styrke/miniconda3/lib/python3.6/site-packages/Cython/Includes/numpy/__init__.pxd.
    [1/1] Cythonizing src/pyfasttext.pyx
    
    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-ottj3fbr/pyfasttext/

Installing cysignals manually with pip install cysignals before trying pip install pyfasttext again solved the problem.

It seems like cysignals somehow didn't really register as a requirement in setup.py?