I'm following this guide https://cmusatyalab.github.io/openface/setup/ of installation. I did:

 mkdir -p ~/src
 cd ~/src
 tar xf dlib-19.1.0.tar.gz
 cd dlib-19.1.0/python_examples
 mkdir build
 cd build
 cmake ../../tools/python
 cmake --build . --config Release
 sudo cp dlib.so /usr/local/lib/python3.4/dist-packages/

It says that at this point I should be able to run import dlib, but if I run it from virtualenv gives me

ImportError: No module named dlib

If I run it outside from virtualenv it gives:

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

What am I doing wrong? How to install dlib for python?

UPD: I've tried same for Python2:

sudo cp dlib.so /usr/local/lib/python2.7/dist-packages/

and it worked for python2. So how to do the same for python3?

  • Are you aware that (at least by default) python is python2 on Ubuntu 14.04? Are you trying to import dlib from python or from python3? Sep 14, 2016 at 14:16
  • Sure, I tried both python2 and python3, but still no effect
    – wasd
    Sep 14, 2016 at 14:19
  • @wasd You said you are trying to run it from a virtualenv? Then you can just activate the virtualenv and use pip to install dlib. Or if yo have dlib installed globally, you can create a virtualenv with the --system-site-packages option.
    – edwinksl
    Sep 14, 2016 at 18:13
  • @edwinksl If I try to install dlib with pip it gives CMake Error at /usr/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:108 (message): Could NOT find PythonLibs (missing: PYTHON_LIBRARIES) (Required is at least version "3.4")
    – wasd
    Sep 15, 2016 at 12:10

1 Answer 1


Found solution by myself but thanks @edwinksl for his tip. In order to install dlib for python3 it's better to use pip:

pip install dlib

You will need boost python. To get it:

sudo apt-get install libboost-all-dev

If you have "Could NOT find PythonLibs (missing: PYTHON_LIBRARIES) (Required is at least version "3.4")" error make sure you have cmake > 2.8 (In my case it is 3.2.2). To install cmake > 2.8:

sudo add-apt-repository ppa:george-edison55/cmake-3.x
sudo apt-get update
sudo apt-get install cmake

That solved the issue for me.

  • 1
    Awesome, I hadn't noticed cmake was only at version 2.8 in Ubuntu 14.04.
    – edwinksl
    Sep 15, 2016 at 17:33

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.