Cython errors out with syntax error in Cython file

[jkempf42]

Please see the below error. I was trying to build a Volttron docker image using the Dockerfile-dev file.

        jak

Step 29/40 : RUN pip install -e . --user
---> Running in 9bb45783b8fc
Obtaining file:///code/volttron
Collecting PyYAML==5.4.1 (from volttron==8.1.3)
Downloading https://files.pythonhosted.org/packages/7a/a5/393c087efdc78091afa2af9f1378762f9821c9c1d7a22c5753fb5ac5f97a/PyYAML-5.4.1-cp37-cp37m-manylinux1_x86_64.whl (636kB)
Collecting cryptography==2.3 (from volttron==8.1.3)
Downloading https://files.pythonhosted.org/packages/c2/fa/fa9a8933c285895935d1392922fe721e9cb1b2c1881d14f149213a227ee3/cryptography-2.3-cp34-abi3-manylinux1_x86_64.whl (2.1MB)
Collecting gevent==20.6.1 (from volttron==8.1.3)
Downloading https://files.pythonhosted.org/packages/9d/a0/42c50f1a021d2404fcad9ac0724fc72de5d084c23fa5447a62f898440802/gevent-20.6.1.tar.gz (5.8MB)
Installing build dependencies: started
Installing build dependencies: finished with status 'done'
Complete output from command python setup.py egg_info:
Compiling src/gevent/resolver/cares.pyx because it changed.
[1/1] Cythonizing src/gevent/resolver/cares.pyx
Compiling src/gevent/libev/corecext.pyx because it changed.
[1/1] Cythonizing src/gevent/libev/corecext.pyx
Compiling src/gevent/_greenlet_primitives.py because it changed.
[1/1] Cythonizing src/gevent/_greenlet_primitives.py
Compiling src/gevent/_hub_primitives.py because it changed.
[1/1] Cythonizing src/gevent/_hub_primitives.py
Compiling src/gevent/_hub_local.py because it changed.
[1/1] Cythonizing src/gevent/_hub_local.py
Compiling src/gevent/_waiter.py because it changed.
[1/1] Cythonizing src/gevent/_waiter.py
warning: src/gevent/resolver/cares.pyx:38:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See cython/cython#4310
warning: src/gevent/resolver/cares.pyx:40:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See cython/cython#4310
warning: src/gevent/resolver/cares.pyx:41:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See cython/cython#4310
warning: src/gevent/libev/corecext.pyx:325:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See cython/cython#4310
warning: src/gevent/libev/corecext.pyx:783:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See cython/cython#4310
warning: src/gevent/libev/corecext.pyx:785:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See cython/cython#4310
warning: src/gevent/libev/corecext.pyx:787:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See cython/cython#4310
warning: src/gevent/libev/corecext.pyx:791:0: The 'DEF' statement is deprecated and will be removed in a future Cython version. Consider using global variables, constants, and in-place literals instead. See cython/cython#4310
warning: src/gevent/_gevent_cgreenlet.pxd:112:33: Declarations should not be declared inline.

Error compiling Cython file:
------------------------------------------------------------
...
cdef load_traceback
cdef Waiter
cdef wait
cdef iwait
cdef reraise
cpdef GEVENT_CONFIG
      ^
------------------------------------------------------------

src/gevent/_gevent_cgreenlet.pxd:181:6: Variables cannot be declared with 'cpdef'. Use 'cdef' instead.
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/tmp/pip-install-ay3ebthy/gevent/setup.py", line 287, in <module>
    EXT_MODULES.append(cythonize1(mod))
  File "/tmp/pip-install-ay3ebthy/gevent/_setuputils.py", line 260, in cythonize1
    common_utility_include_dir=COMMON_UTILITY_INCLUDE_DIR,
  File "/tmp/pip-build-env-cxr67hol/lib/python3.7/site-packages/Cython/Build/Dependencies.py", line 1134, in cythonize
    cythonize_one(*args)
  File "/tmp/pip-build-env-cxr67hol/lib/python3.7/site-packages/Cython/Build/Dependencies.py", line 1301, in cythonize_one
    raise CompileError(None, pyx_file)
Cython.Compiler.Errors.CompileError: src/gevent/greenlet.py
Compiling src/gevent/greenlet.py because it changed.
[1/1] Cythonizing src/gevent/greenlet.py

----------------------------------------

Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-install-ay3ebthy/gevent/
The command 'bash -c pip install -e . --user' returned a non-zero code: 1