OpenCV GTK+2.x error – “Unspecified error (The function is not implemented…)”

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First check whether libgtk2.0-dev is installed properly. If you have installed aptitude package manager, run the following:

sudo aptitude search libgtk2.0-dev

It should return like this:

i  libgtk2.0-dev              - development files for the GTK+ library
p  libgtk2.0-dev:i386         - development files for the GTK+ library

You need to build the files once again. Locate your OpenCV folder. Create a new folder and name it Release. Enter into this folder. For example,

cd /home/user_name/OpenCv
mkdir Release
cd Release

Now build using CMake with following command:

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 ..

Remember to put WITH_GTK=ON during CMake.

After this step, enter the command,

make
sudo make install

This should resolve your problem. If you have broken dependencies for libgtk2.0-dev, then install a fresh copy of libgtk2.0-dev using aptitude.

sudo aptitude install libgtk2.0-dev

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