Bug#826036: python3-pyfftw: importing pyfftw fails with ImportError/undefined symbol fftwl_plan_with_nthreads

[Marten van Kerkwijk]

Package: python3-pyfftw
Version: 0.10.1+dfsg1-1+b1
Severity: grave
Justification: renders package unusable

Dear Maintainer,

After installing python3-pyfftw (and its libfftw3 dependencies), importing
it in python3 fails (same for python-pyfftw and python):

mhvk at swan:/work/mhvk/scintillometry/evn_14jun$ python3
Python 3.5.1+ (default, May  9 2016, 11:00:17)
[GCC 5.3.1 20160429] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import pyfftw
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
    File "/usr/lib/python3/dist-packages/pyfftw/__init__.py", line 16, in <module>
        from .pyfftw import (
	ImportError: /usr/lib/python3/dist-packages/pyfftw/pyfftw.cpython-35m-x86_64-linux-gnu.so: undefined symbol: fftwl_plan_with_nthreads

With all best regards,

Marten van Kerkwijk

-- System Information:
Debian Release: stretch/sid
  APT prefers testing
  APT policy: (900, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.5.0-1-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_CA.UTF-8, LC_CTYPE=en_CA.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages python3-pyfftw depends on:
ii  libc6                               2.22-9
ii  libfftw3-double3                    3.3.4-2+b1
ii  libfftw3-long3                      3.3.4-2+b1
ii  libfftw3-single3                    3.3.4-2+b1
ii  python3                             3.5.1-3
ii  python3-numpy [python3-numpy-abi9]  1:1.11.0-1

python3-pyfftw recommends no packages.

python3-pyfftw suggests no packages.

-- no debconf information