Pass shell to cythonize.py. See Issue
@@ -144,7 +144,7 @@ def generate_cython(root, source):
print('Cythonizing sources')
p = subprocess.call([sys.executable,
os.path.join(root, 'bin', 'cythonize.py'),
- source])
+ source], shell=True, env=os.environ)
if p != 0:
raise RuntimeError('Running cythonize failed')
