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2015-05-25 07:07:59 -0500 answered a question opencv 3.0 build error

Had the same problem, in my case it's because cmake-gui detected eigen2 instead of eigen3 . So in cmake-gui i just changed EIGEN_INCLUDE_PATH from /usr/include/eigen3 to /usr/include/eigen2 then it worked, it compiled successfully opencv 3.0.0-rc1 (it's not the latest commit, i first ran git checkout 3.0.0-rc1).

2015-05-17 00:44:21 -0500 answered a question cross compile OpenCV with FFMPEG for ARM Linux

Try this export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig

it worked for me.