Description:
Importing pygit2 in python2 causes the following traceback:

Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/usr/lib/python2.7/site-packages/pygit2/__init__.py", line 35, in <module>
from .blame import Blame, BlameHunk
File "/usr/lib/python2.7/site-packages/pygit2/blame.py", line 32, in <module>
from .errors import check_error
File "/usr/lib/python2.7/site-packages/pygit2/errors.py", line 29, in <module>
from .ffi import ffi, C
File "/usr/lib/python2.7/site-packages/pygit2/ffi.py", line 35, in <module>
ffi, C = get_ffi()
File "/usr/lib/python2.7/site-packages/pygit2/_utils.py", line 101, in get_ffi
include_dirs=[libgit2_include], library_dirs=[libgit2_lib])
File "/usr/lib/python2.7/site-packages/cffi/api.py", line 367, in verify
lib = self.verifier.load_library()
File "/usr/lib/python2.7/site-packages/cffi/verifier.py", line 95, in load_library
self._write_source()
File "/usr/lib/python2.7/site-packages/cffi/verifier.py", line 183, in _write_source
with open(self.sourcefilename, "w") as fp:
IOError: [Errno 2] No such file or directory: '/usr/lib/python2.7/site-packages/pygit2/__pycache__/pygit2_cffi_a2d0f8b5x5470904.c'

Additional info:
pygit2 works well when compiled using ABS.
See also this thread https://bbs.archlinux.org/viewtopic.php?pid=1510377#p1510377

Steps to reproduce:

1) pacman -S python2-pygit2
2) python2 -c 'import pygit2'