Failed Cython version check on Arch Linux in v0.8

[dark-saber]

Trying to build python-djvulibre 0.8 in Arch Linux leads to the following error:

==> Starting build()...
running build
running build_py
running build_ext
cythoning 'djvu.sexpr' extension
generating build/temp.linux-x86_64-2.7/src/sexpr.c from djvu/sexpr.pyx, build/temp.linux-x86_64-2.7/src/config.pxi, djvu/common.pxi, djvu/sexpr.pxd, djvu/decode.pxd
Traceback (most recent call last):
  File "setup.py", line 300, in <module>
    distutils.core.setup(**setup_params)
  File "/usr/lib/python2.7/distutils/core.py", line 151, in setup
    dist.run_commands()
  File "/usr/lib/python2.7/distutils/dist.py", line 953, in run_commands
    self.run_command(cmd)
  File "/usr/lib/python2.7/distutils/dist.py", line 972, in run_command
    cmd_obj.run()
  File "/usr/lib/python2.7/distutils/command/build.py", line 127, in run
    self.run_command(cmd_name)
  File "/usr/lib/python2.7/distutils/cmd.py", line 326, in run_command
    self.distribution.run_command(command)
  File "/usr/lib/python2.7/distutils/dist.py", line 972, in run_command
    cmd_obj.run()
  File "setup.py", line 202, in run
    distutils.command.build_ext.build_ext.run(self)
  File "/usr/lib/python2.7/distutils/command/build_ext.py", line 339, in run
    self.build_extensions()
  File "setup.py", line 207, in build_extensions
    ext.sources = list(self.cython_sources(ext))
  File "setup.py", line 233, in cython_sources
    self.make_file(depends, target, build_c, [source, target])
  File "/usr/lib/python2.7/distutils/cmd.py", line 422, in make_file
    self.execute(func, args, exec_msg, level)
  File "/usr/lib/python2.7/distutils/cmd.py", line 349, in execute
    util.execute(func, args, msg, dry_run=self.dry_run)
  File "/usr/lib/python2.7/distutils/util.py", line 309, in execute
    func(*args)
  File "setup.py", line 226, in build_c
    raise RuntimeError('Cython >= {ver} is required'.format(ver=req_cython_version))
RuntimeError: Cython >= 0.19 is required
==> ERROR: A failure occurred in build().
    Aborting...

I have cython and cython2 installed, but it seems that the python module is somehow called cython here:

python2 -m cython --version 
Cython version 0.24.1

python2 -m cython2 --version
/usr/bin/python2: No module named cython2

python -m cython --version 
Cython version 0.24.1

python -m cython2 --version
/usr/bin/python3: No module named cython2

[jwilk]

Very odd.

python -m cython --version
Cython version 0.24.1

This is exactly how the setup script checks for Cython version, so it should work.

Oh wait, I think I know what's going on. In the PKGBUILD I see this line:

  sed -i "s/'cython'/'cython2'/" setup.py

which would change

    cmdline = ['python', '-m', 'cython', '--version']

to

    cmdline = ['python', '-m', 'cython2', '--version']

The latter of course wouldn't work.

[dark-saber]

Aha, thank you! I've completely missed that line, and wondered, why cython module was named cython2 in other distros.

[jwilk]

Shall we close the bug?

[dark-saber]

Yes, of course. Sorry for the inconvenience!