Is there an advantage to building opencv yourself?

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__Advantages:__

• you can build OpenCV better optimized for this machine (cmake variables CPU_BASELINE and CPU_DISPATCH) - read more here, by default we use SSSE3 as baseline
• you can build only limited subset of a library (just opencv_core and opencv_imgproc for example), can compose it into a single opencv_world.dll binary, make it static or dynamic
• you can choose different options for video backends, parallel_for backend, windows backends, OpenCL, OpenGL support and many others
• build modules which are not provided in default distributions: opencv_viz, all CUDA modules, all opencv_contrib modules
• replace subset of functionality with your own functions via HAL (read more here)
• you can built accuracy and performance tests and check how good does your platform perform basic operations before experimenting with complex algorithms

__Disadvantages:__

• you need some free time for this