![]() ![]() Configure with cmake and compile with makeīelow, you'll find detailed explanations of the whole process, some build scripts, and particularities you might encounter.Getting the dependencies or packages that FreeCAD depends on.For example, you can have libopencv_videoio_ffmpeg_3.so and libopencv_videoio_ffmpeg_4.so plugins and the first one which can be loaded successfully will occupy internal slot and stop probing process.On recent linux distributions, FreeCAD is generally easy to build, since all dependencies are usually provided by the package manager. Each supported prefix can be used to load only one library, however multiple candidates can be probed for a single prefix. It is important to use opencv_ name prefix for plugins so that loader is able to find them. ![]() Note that some functionality can be limited or work slower when backends are loaded dynamically due to extra barrier between OpenCV and corresponding third-party library.īuild procedure is similar to the main OpenCV build, but you have to use special CMake projects located in corresponding subdirectories, these folders can also contain reference scripts and Docker images. Note It is recommended to use compiler, configuration and build options which are compatible to the one used for OpenCV build, otherwise resulting library can refuse to load or cause other runtime problems. In other cases plugins should be built separately in their own build procedure and this section describes such standalone build process. In some cases it is possible to build plugins together with OpenCV by setting options like VIDEOIO_PLUGIN_LIST or HIGHGUI_PLUGIN_LIST, more options related to this scenario can be found in the OpenCV configuration options reference. For now modules core, videoio and highgui support this mechanism for some of their dependencies. It helps to produce adaptive binary distributions which can work on systems with less dependencies and extend functionality just by installing missing libraries. It is possible to decouple some of OpenCV dependencies and make them optional by extracting parts of the code into dynamically-loaded plugins. If the installation root location is a protected system directory, so the installation process must be run with superuser or administrator privileges (e.g. To clone repositories run the following commands in console ( git must be installed):Ĭmake -build -target install Note This step is optional, OpenCV can be used directly from the build directory.
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