media-libs/opencv has the option to enable usage of dev-cpp/eigen for computations via the eigen use flag. however, this requires dev-cpp/eigen:2. If dev-cpp/eigen:3 is installed beforehand, the build of media-libs/opencv fails, even with the eigen use flag disabled. Reproducible: Always Steps to Reproduce: 1. emerge dev-cpp/eigen:3 2. emerge media-libs/opencv Actual Results: [35m[1mScanning dependencies of target opencv_traincascade [ 57%] [32mBuilding CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/src/oneway.o [0m[0m[ 57%] [32mBuilding CXX object modules/traincascade/CMakeFiles/opencv_traincascade.dir/traincascade.o [0m[ 57%] [32mBuilding CXX object modules/traincascade/CMakeFiles/opencv_traincascade.dir/cascadeclassifier.o [0m[ 57%] [32mBuilding CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/src/evaluation.o [0m[ 58%] [32mBuilding CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/src/stardetector.o [0m[ 58%] [32mBuilding CXX object modules/traincascade/CMakeFiles/opencv_traincascade.dir/boost.o [0m[ 58%] [32mBuilding CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/src/brief.o [0m[ 58%] [32mBuilding CXX object modules/features2d/CMakeFiles/opencv_features2d.dir/src/matchers.o [0mIn file included from /var/tmp/paludis/media-libs-opencv-2.2.0-r10/work/OpenCV-2.2.0/modules/features2d/src/matchers.cpp:45:0: /usr/include/eigen3/Eigen/Array:8:4: error: #error The Eigen/Array header does no longer exist in Eigen3. All that functionality has moved to Eigen/Core. [ 59%] [32mBuilding CXX object modules/traincascade/CMakeFiles/opencv_traincascade.dir/features.o [0mmake[2]: *** [modules/features2d/CMakeFiles/opencv_features2d.dir/src/matchers.o] Error 1 make[1]: *** [modules/features2d/CMakeFiles/opencv_features2d.dir/all] Error 2 make[1]: *** Waiting for unfinished jobs.... [ 59%] [32mBuilding CXX object modules/traincascade/CMakeFiles/opencv_traincascade.dir/haarfeatures.o [0m[ 59%] [32mBuilding CXX object modules/traincascade/CMakeFiles/opencv_traincascade.dir/lbpfeatures.o [0m[ 59%] [32mBuilding CXX object modules/traincascade/CMakeFiles/opencv_traincascade.dir/imagestorage.o [0m[31m[1mLinking CXX executable ../../bin/opencv_traincascade [0m[ 59%] Built target opencv_traincascade make: *** [all] Error 2 Expected Results: It should build without trying to use eigen at all, if use flag is disabled.
Please attach full build.log
(In reply to comment #1) > Please attach full build.log Please reopen when you provide needed info, thanks
