文章作者：Tyan
博客：noahsnail.com ?|? CSDN ?|? 簡書

在Mac中安裝OpenCV3時，如果需要安裝--with-contrib，則會報錯，OpenCV 3的安裝命令為：

brew install opencv3 --with-contrib

錯誤信息如下：

In file included from /usr/local/include/eigen3/Eigen/Core:422:
In file included from /usr/local/include/eigen3/Eigen/src/Core/ArrayBase.h:93:
/usr/local/include/eigen3/Eigen/src/Core/../plugins/ArrayCwiseUnaryOps.h:489:14: error: unknown type name 'LgammaReturnType'; did you mean 'DigammaReturnType'?
inline const LgammaReturnType
             ^
/usr/local/include/eigen3/Eigen/src/Core/../plugins/ArrayCwiseUnaryOps.h:471:74: note: 'DigammaReturnType' declared here
typedef CwiseUnaryOp<internal::scalar_digamma_op<Scalar>, const Derived> DigammaReturnType;
                                                                         ^
4 errors generated.
make[2]: *** [modules/python2/CMakeFiles/opencv_python2.dir/__/src2/cv2.cpp.o] Error 1
make[1]: *** [modules/python2/CMakeFiles/opencv_python2.dir/all] Error 2
make: *** [all] Error 2

這里主要是OpenCV 3 contrib支持eigen-3.2.10但不支持eigen-3.3.0，因此需要安裝eigen-3.2.10，安裝命令如下：

# 安裝
brew install homebrew/versions/eigen32

# link
brew link --force eigen32

然后再安裝OpenCV 3就可以了，當然如果不需要contrib選項，安裝是沒問題的。