Gentoo's Bugzilla –
Attachment 409502 Details for
Bug 558208media-libs/openimageio-1.3.5[opencv] with >=media-libs/opencv-3 - ../libOpenImageIO/libOpenImageIO.so.1.3.5: undefined reference to `cvCreateCameraCapture', undefined reference to `cvQueryFrame', undefined reference to `cvReleaseCapture'