Ubuntu16.03 OpenCV问题：OpenCV Error: Unspecified error (The function is not implemented...

//首先查看是否已安装gtk2.0
sudo aptitude search libgtk2.0-dev
//结果应该像这样:
i  libgtk2.0-dev              - development files for the GTK+ library 
p  libgtk2.0-dev:i386         - development files for the GTK+ library
//然后重新编译openCV:
cd /home/user_name/OpenCv
mkdir Release
cd Release
//cmake
cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D WITH_TBB=ON -D BUILD_NEW_PYTHON_SUPPORT=ON -D WITH_V4L=ON -D INSTALL_C_EXAMPLES=ON -D INSTALL_PYTHON_EXAMPLES=ON -D BUILD_EXAMPLES=ON -D WITH_QT=ON -D WITH_GTK=ON -D WITH_OPENGL=ON ..
//cmake的时候别忘了用 WITH_GTK=ON
//然后编译
make
sudo make install
//ok，问题解决

//另外，安装libgtk2.0-dev用如下命令

sudo aptitude install libgtk2.0-dev