How to: Set up OpenCV on MacOS X and XCode 5

set_up_opencv_on_mac

###Download XCode from the App Store
Get it from [here](https://itunes.apple.com/en/app/xcode/id497799835?mt=12)

###Get cmake
Use/get a package manager, such as [homebrew](http://brew.sh/).
Open a terminal window and type the following
```
brew install cmake
```
This will get the required packages for *cmake*.

###Get and install OpenCV
* Download the latest [OpenCV for Linux/Mac](http://opencv.org/downloads.html)
* Navigate to location of downloaded file and untar it with the following command 
```
tar xvzf opencv-2.4.6.1.tar.gz
```
* Navigate to extracted folder `cd path/to/folder`
* Create a build directory and build opencv with the following commands
```
mkdir build
cd build
cmake -G "Unix Makefiles"...
```
* Make and install
```
make -j8
sudo make install
```

###Set up an OpenCV project in XCode
* Start XCode
* Create new "Command Line Tool" project with type `C++` [screenshot](https://f.cloud.github.com/assets/285590/1329495/379c7872-3518-11e3-8e11-3a83b45c01f8.png)

* **Add OpenCV to your project**
    * Right click your project on the sidebar, select "Add files to..." [screenshot](https://f.cloud.github.com/assets/285590/1329506/6ec69918-3518-11e3-9a17-c09404fe4d28.png)
    * When the file chooser dialog opens up, press `cmd` + `shift` + `G` and enter "/usr/local/lib" [screenshot](https://f.cloud.github.com/assets/285590/1329515/974f0ff0-3518-11e3-9568-ce6530c7c6c0.png)
    * Select the required OpenCV files (named in the format `libopencv_*.dylib`), or select all. Press `Add` or `Return` [screenshot](https://f.cloud.github.com/assets/285590/1329526/af92fb62-3518-11e3-9b41-b012f00b09b2.png)
    * You will see that all selected files are now in the sidebar. You can youp them together by creating a new _Group_ and dragging the files in there. [screenshot](https://f.cloud.github.com/assets/285590/1329527/c25dac2e-3518-11e3-8ab3-5b3d3412260a.png)
* **Configure your project**
    * Click on the project (in the side bar), and you should see the Project settings come up in the middle of the editor
    * Click the `All` view (top left corner)
    * In the search bar type "**Header Search Paths**", double click the value, remove the existing entries and add 
`/usr/local/lib` and `/usr/local/include` [screenshot](https://f.cloud.github.com/assets/285590/1329534/00b1b416-3519-11e3-86f8-fa214990f7f2.png)
    * Now search for "**Library Search Paths**" and replace the values with `/usr/local/lib`
    * Search for "**C++ Standard Library**" and select "*libstdc++ (GNU C++ Standard Library)*" [screenshot](https://f.cloud.github.com/assets/285590/1329538/0f478456-3519-11e3-9643-1b6500bb7080.png)
* **Try the configuration**
    * Run one of the sample OpenCV projects

I follow this steps but i have error when compiling:

Ld /Users/diegopuentes/Library/Developer/Xcode/DerivedData/opencv_test-dsxczmtldmtrgiddqoomxytfgijt/Build/Products/Debug/opencv_test normal x86_64
cd /Users/diegopuentes/Documents/opencv_test
setenv MACOSX_DEPLOYMENT_TARGET 10.9
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk -L/Users/diegopuentes/Library/Developer/Xcode/DerivedData/opencv_test-dsxczmtldmtrgiddqoomxytfgijt/Build/Products/Debug -L/usr/local/lib -L/usr/local/lib/python2.7/site-packages -F/Users/diegopuentes/Library/Developer/Xcode/DerivedData/opencv_test-dsxczmtldmtrgiddqoomxytfgijt/Build/Products/Debug -filelist /Users/diegopuentes/Library/Developer/Xcode/DerivedData/opencv_test-dsxczmtldmtrgiddqoomxytfgijt/Build/Intermediates/opencv_test.build/Debug/opencv_test.build/Objects-normal/x86_64/opencv_test.LinkFileList -mmacosx-version-min=10.9 -stdlib=libstdc++ -lopencv_video.2.4.7 -lopencv_flann.2.4.7 -lopencv_stitching.2.4.7 -lopencv_core.2.4.7 -lopencv_photo.2.4.7 -lopencv_legacy.2.4.7 -lopencv_objdetect.2.4.7 -lopencv_ml.2.4.7 -lopencv_superres.2.4.7 -lopencv_ocl.2.4.7 -lopencv_videostab.2.4.7 -lopencv_contrib.2.4.7 -lopencv_imgproc.2.4.7 -lopencv_highgui.2.4.7 -lopencv_nonfree.2.4.7 -lopencv_features2d.2.4.7 -lopencv_calib3d.2.4.7 -lopencv_gpu.2.4.7 -Xlinker -dependency_info -Xlinker /Users/diegopuentes/Library/Developer/Xcode/DerivedData/opencv_test-dsxczmtldmtrgiddqoomxytfgijt/Build/Intermediates/opencv_test.build/Debug/opencv_test.build/Objects-normal/x86_64/opencv_test_dependency_info.dat -o /Users/diegopuentes/Library/Developer/Xcode/DerivedData/opencv_test-dsxczmtldmtrgiddqoomxytfgijt/Build/Products/Debug/opencv_test

Undefined symbols for architecture x86_64:
"cv::getTextSize(std::string const&, int, double, int, int*)", referenced from:
_main in main.o
"cv::imshow(std::string const&, cv::InputArray const&)", referenced from:
main in main.o
"cv::putText(cv::Mat&, std::string const&, cv::Point, int, double, cv::Scalar, int, int, bool)", referenced from:
_main in main.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

clang: error: linker command failed with exit code 1 (use -v to see invocation)

Thank you. This really helped me set up OpenCV in Xcode. Thanks a lot again.

@dantesc, I had similar errors which were solved by switching the "C++ Standard Library" setting in my Xcode project's "Build Settings" fromlibstdc++ to libc++