How can I solve this problem?

[zhanking321]

Hello，when I run the command pip install -r requirements.txt, there exits the problem:

Complete output from command python setup.py egg_info:

Error compiling Cython file:
------------------------------------------------------------
...
"""Knowledge-base for entity or concept linking."""
from cymem.cymem cimport Pool

[zhanking321]

Error compiling Cython file:

...
"""Knowledge-base for entity or concept linking."""
from cymem.cymem cimport Pool
^
------------------------------------------------------------

spacy/kb.pxd:2:0: 'cymem/cymem.pxd' not found

Error compiling Cython file:
------------------------------------------------------------
...
"""Knowledge-base for entity or concept linking."""
from cymem.cymem cimport Pool
^
------------------------------------------------------------

spacy/kb.pxd:2:0: 'cymem/cymem/Pool.pxd' not found

Error compiling Cython file:
------------------------------------------------------------
...
"""Knowledge-base for entity or concept linking."""
from cymem.cymem cimport Pool
from preshed.maps cimport PreshMap
^
------------------------------------------------------------

spacy/kb.pxd:3:0: 'preshed/maps.pxd' not found

Error compiling Cython file:
------------------------------------------------------------
...
"""Knowledge-base for entity or concept linking."""
from cymem.cymem cimport Pool
from preshed.maps cimport PreshMap
^
------------------------------------------------------------

spacy/kb.pxd:3:0: 'preshed/maps/PreshMap.pxd' not found

Error compiling Cython file:
------------------------------------------------------------
...
from libcpp.vector cimport vector
from preshed.maps cimport PreshMap
from cymem.cymem cimport Pool
from murmurhash.mrmr cimport hash64
^
------------------------------------------------------------

spacy/vocab.pxd:4:0: 'murmurhash/mrmr.pxd' not found