/usr/local/bin/cmake -E cmake_progress_start /usr/ports/graphics/opencv-core/work/OpenCV-2.0.0/build/CMakeFiles 0
===>  Installing for opencv-2.0.0_3
===>   opencv-2.0.0_3 depends on executable: pkg-config - found
===>   Generating temporary packing list
===>  Checking if graphics/opencv-core already installed
pkg_info: package bglive-2.0.0-rc35 has no origin recorded
===>   opencv-2.0.0_3 is already installed
      You may wish to ``make deinstall'' and install this port again
      by ``make reinstall'' to upgrade it properly.
      If you really wish to overwrite the old port of graphics/opencv-core
      without deleting it first, set the variable "FORCE_PKG_REGISTER"
      in your environment or the "make install" command line.
*** Error code 1

Stop in /usr/ports/graphics/opencv-core.
*** Error code 1

Stop in /usr/ports/multimedia/ffmpeg.