cython issues on EL8

[Orion Poplawski]

I could use some help with some cython issues building pandas for EL8. 
First attempt:

https://koji.fedoraproject.org/koji/taskinfo?taskID=37887295

running build_ext
pandas._libs.algos: -> [['pandas/_libs/algos.c']]
Traceback (most recent call last):
   File "setup.py", line 838, in <module>
     **setuptools_kwargs
   File "/usr/lib/python3.6/site-packages/setuptools/__init__.py", line 
129, in setup
     return distutils.core.setup(**attrs)
   File "/usr/lib64/python3.6/distutils/core.py", line 148, in setup
     dist.run_commands()
   File "/usr/lib64/python3.6/distutils/dist.py", line 955, in run_commands
     self.run_command(cmd)
   File "/usr/lib64/python3.6/distutils/dist.py", line 974, in run_command
     cmd_obj.run()
   File "/usr/lib64/python3.6/distutils/command/build.py", line 135, in run
     self.run_command(cmd_name)
   File "/usr/lib64/python3.6/distutils/cmd.py", line 313, in run_command
     self.distribution.run_command(command)
   File "/usr/lib64/python3.6/distutils/dist.py", line 974, in run_command
     cmd_obj.run()
   File "/usr/lib64/python3.6/distutils/command/build_ext.py", line 339, 
in run
     self.build_extensions()
   File "setup.py", line 407, in build_extensions
     self.check_cython_extensions(self.extensions)
   File "setup.py", line 402, in check_cython_extensions
     src=src
Exception: Cython-generated file 'pandas/_libs/algos.c' not found.
                 Cython is required to compile pandas from a development 
branch.
                 Please install Cython or download a release package of 
pandas.

Compared to a rawhide build, it seems like the cython c files are not 
being automatically regenerated at the start of the build.  What 
component is supposed to handle this?

Second attempt to run cython by hand generates another error:

https://koji.fedoraproject.org/koji/taskinfo?taskID=37887587

+ cython ./pandas/_libs/missing.pyx ./pandas/_libs/testing.pyx 
./pandas/_libs/interval.pyx ./pandas/_libs/window.pyx 
./pandas/_libs/internals.pyx ./pandas/_libs/join.pyx 
./pandas/_libs/index.pyx ./pandas/_libs/writers.pyx 
./pandas/_libs/groupby.pyx ./pandas/_libs/reduction.pyx 
./pandas/_libs/hashtable.pyx ./pandas/_libs/parsers.pyx 
./pandas/_libs/tslibs/conversion.pyx 
./pandas/_libs/tslibs/np_datetime.pyx ./pandas/_libs/tslibs/period.pyx 
./pandas/_libs/tslibs/timedeltas.pyx ./pandas/_libs/tslibs/ccalendar.pyx 
./pandas/_libs/tslibs/strptime.pyx ./pandas/_libs/tslibs/resolution.pyx 
./pandas/_libs/tslibs/fields.pyx ./pandas/_libs/tslibs/c_timestamp.pyx 
./pandas/_libs/tslibs/offsets.pyx ./pandas/_libs/tslibs/timestamps.pyx 
./pandas/_libs/tslibs/parsing.pyx ./pandas/_libs/tslibs/tzconversion.pyx 
./pandas/_libs/tslibs/timezones.pyx 
./pandas/_libs/tslibs/frequencies.pyx ./pandas/_libs/tslibs/nattype.pyx 
./pandas/_libs/hashing.pyx ./pandas/_libs/tslib.pyx 
./pandas/_libs/indexing.pyx ./pandas/_libs/sparse.pyx 
./pandas/_libs/algos.pyx ./pandas/_libs/skiplist.pyx 
./pandas/_libs/ops.pyx ./pandas/_libs/reshape.pyx ./pandas/_libs/lib.pyx 
./pandas/_libs/properties.pyx ./pandas/io/sas/sas.pyx 
./pandas/io/msgpack/_packer.pyx ./pandas/io/msgpack/_unpacker.pyx
Error compiling Cython file:
------------------------------------------------------------
...
         cdef int status
         with nogil:
             status = tokenize_nrows(self.parser, nrows)
         if self.parser.warn_msg != NULL:
             print(self.parser.warn_msg, file=sys.stderr)
                                            ^
------------------------------------------------------------
pandas/_libs/parsers.pyx:932:44: Expected ')', found '='

It this because cython is too old in EL8?

TIA,

   Orion

-- 
Orion Poplawski
Manager of NWRA Technical Systems          720-772-5637
NWRA, Boulder/CoRA Office             FAX: [phone]
3380 Mitchell Lane                       orion(a)nwra.com
Boulder, CO 80301                 https://www.nwra.com/