Update requirements

kdtree/setup.py

 from distutils.core import setup
 from distutils.extension import Extension
+
+import numpy
 from Cython.Build import cythonize
 
 extensions = [
@@ -7,8 +9,8 @@ extensions = [
         "kdtree",
         language="c++",
         define_macros=[("NPY_NO_DEPRECATED_API", "NPY_1_7_API_VERSION")],
+        include_dirs=[numpy.get_include()],
         sources=["kdtree.pyx"],
-        libraries=["crypto", "fmt"],
     ),
 ]
 

requirements.txt

@@ -3,4 +3,4 @@ jupyter==1.0.0
 line-profiler==3.1.0
 matplotlib==3.4.1
 numpy==1.20.2
--e git+https://lab.nexedi.com/nexedi/cython.git@608c29a9ab7b7803c900621424279a9e71fac106#egg=Cython&subdirectory=../../cython
+-e git+https://lab.nexedi.com/nexedi/cython.git@fd3a224472d75f7c6107828c1e4b9587f3990a46#egg=Cython
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