Opencv

build opencv 3.3 on ubuntu 14.04 successfully after following

http://www.linuxfromscratch.org/blfs/view/cvs/general/opencv.html

ipp_file=ippicv_2017u2_lnx_intel64_20170418.tgz &&
ipp_hash=$(md5sum ../$ipp_file | cut -d" " -f1) &&
ipp_dir=.cache/ippicv                           &&

mkdir -p $ipp_dir &&
cp ../$ipp_file $ipp_dir/$ipp_hash-$ipp_file

tar xf ../opencv_contrib-3.3.0.tar.gz

mkdir build &&
cd    build &&

make clean     &&
cmake -DCMAKE_INSTALL_PREFIX=/usr      \
      -DCMAKE_BUILD_TYPE=Release       \
      -DENABLE_CXX11=OFF                \
      -DBUILD_PERF_TESTS=OFF           \
      -DWITH_XINE=ON                   \
      -DFORCE_VTK=ON                   \
      -DBUILD_TESTS=OFF                \
      -DENABLE_PRECOMPILED_HEADERS=OFF \
      -DCMAKE_SKIP_RPATH=ON            \
      -DBUILD_WITH_DEBUG_INFO=OFF      \
      -DBUILD_EXAMPLES=ON              \
      -DOPENCV_EXTRA_MODULES_PATH=../opencv_contrib-3.3.0/modules  \
      -Wno-dev  ..                     &&
make
or make -j3  # run 3 parallel jobs  # when troubleshooting, use 1 job, VERBOSE=1

#      -DENABLE_CXX11=OFF     worked for me

to run python demo
gong@gong-u1404:~/opencv/opencv-3.3.0/samples/python$ /usr/bin/python demo.py