ImportError: dynamic module does not define init function (initcopus)

On Arch x86_64 multilib with python 2.7 and cython2 0.22-1 :

...
File "/home/conky/runtime/pymumble/pyopus/opus.py", line 4, in
import copus
ImportError: dynamic module does not define init function (initcopus)

(note: when attempting to run mumblerecbot).

[Jonkus]

For anyone else having trouble with this (using Arch-Linux):
in pyopus/copus/Makefile and pycelt/celt_0_XX/Makefile
change "python" to "python2", then it will be compiled correctly for python2 instead of version 3