ImportError: Cannot load dynamic library. Did you compile FLANN?

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You install pyflann as :

sudo pip install pyflann

and after that, test it via ipython

import pyflann

it says you have NOT compile flann. As follows:

In [1]: import pyflann---------------------------------------------------------------------------ImportError                               Traceback (most recent call last)<ipython-input-1-b6d4c333a325> in <module>()----> 1 import pyflann/usr/local/lib/python2.7/dist-packages/pyflann/__init__.py in <module>()     25 #THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.     26 ---> 27 from index import *     28 from io.dataset import load, save     29 try:/usr/local/lib/python2.7/dist-packages/pyflann/index.py in <module>()     25 #THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.     26 ---> 27 from bindings.flann_ctypes import *     28 from io.dataset import *     29 import numpy.random as _rn/usr/local/lib/python2.7/dist-packages/pyflann/bindings/__init__.py in <module>()     28 #from pyflann_parameters import parameter_list, algorithm_names     29 #from pyflann_parameters import centers_init_names, log_level_names---> 30 from flann_ctypes import */usr/local/lib/python2.7/dist-packages/pyflann/bindings/flann_ctypes.py in <module>()    171 flannlib = load_flann_library()    172 if flannlib == None:--> 173     raise ImportError('Cannot load dynamic library. Did you compile FLANN?')    174     175 ImportError: Cannot load dynamic library. Did you compile FLANN?

Deep in /usr/local/lib/python2.7/dist-packages/pyflann/lib/linux/libflann.so and you will find a libflann.so already exists. BUT it’s size is 0, that’s empty library.

Now compile a flann step by step:
1.download from HERE
2.extract it

unzip flann-1.8.4-src.zip

3.make

cd flann-1.8.4-srcmkdir buildcd buildcmake ..make -j8

4.cp flann-1.8.4-src/build/lib/libflann.so into /usr/local/lib/python2.7/dist-packages/pyflann/lib/linux/libflann.so

sudo cp lib/libflann.so /usr/local/lib/python2.7/dist-packages/pyflann/lib/linux/libflann.so

5.re-try import pyflann now.

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