CH4 project installation problem for xcode.

[areslui]

I want to use this project to practice for my ios development, but I've never handle this things before:

MacOSX (Xcode):
export OpenCV_DIR="~/OpenCV/build"
mkdir build
cd build
cmake -G Xcode -D OpenCV_DIR=$OpenCV_DIR ..
open ExploringSfMWithOpenCV.xcodeproj

I've spent my whole day to search this thing "export path...", could someone help me out?
My problem is I don't know what is this mean "export OpenCV_DIR="~/OpenCV/build"" and this "cmake -G Xcode -D OpenCV_DIR=$OpenCV_DIR". It's a directory path or something?
If you can help me step by step, that will be great.

Thanks
Ares

[areslui]

I have already solved this problem by myself but there is another issue I just encountered. I followed the instruction of readme.md in document and execute this "cmake -G Xcode -D OpenCV_DIR=$OpenCV_DIR .." and following is the error message:

Okaylens-Aresde-iMac:build okaylens-ares$ cmake -G Xcode -D OpenCV_DIR=$OpenCV_DIR ..
-- Checking for module 'eigen3'
-- Found eigen3, version 3.3.3
-- Boost version: 1.59.0
-- Found the following Boost libraries:
-- system
-- filesystem
-- thread
-- date_time
-- iostreams
-- chrono
-- atomic
-- regex
-- Checking for module 'openni-dev'
-- No package 'openni-dev' found
-- Could NOT find openni (missing: OPENNI_LIBRARY OPENNI_INCLUDE_DIRS)
** WARNING ** io features related to openni will be disabled
-- Checking for module 'flann'
-- Found flann, version 1.9.1
-- Checking for module 'flann'
-- Found flann, version 1.9.1
-- Checking for module 'openni-dev'
-- No package 'openni-dev' found
-- Could NOT find openni (missing: OPENNI_LIBRARY OPENNI_INCLUDE_DIRS)
** WARNING ** visualization features related to openni will be disabled
-- Checking for module 'openni-dev'
-- No package 'openni-dev' found
-- Could NOT find openni (missing: OPENNI_LIBRARY OPENNI_INCLUDE_DIRS)
** WARNING ** apps features related to openni will be disabled
-- looking for PCL_COMMON
-- looking for PCL_OCTREE
-- looking for PCL_IO
-- looking for PCL_KDTREE
-- looking for PCL_SEARCH
-- looking for PCL_SAMPLE_CONSENSUS
-- looking for PCL_FILTERS
-- looking for PCL_GEOMETRY
-- looking for PCL_SEGMENTATION
-- looking for PCL_VISUALIZATION
-- looking for PCL_FEATURES
-- looking for PCL_SURFACE
-- looking for PCL_REGISTRATION
-- looking for PCL_KEYPOINTS
-- looking for PCL_TRACKING
-- looking for PCL_APPS
-- will use Eigen
-- Try OpenMP C flag = [-fopenmp=libomp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP C flag = [ ]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP C flag = [-fopenmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP C flag = [/openmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP C flag = [-Qopenmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP C flag = [-openmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP C flag = [-xopenmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP C flag = [+Oopenmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP C flag = [-qsmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP C flag = [-mp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP CXX flag = [-fopenmp=libomp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP CXX flag = [ ]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP CXX flag = [-fopenmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP CXX flag = [/openmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP CXX flag = [-Qopenmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP CXX flag = [-openmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP CXX flag = [-xopenmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP CXX flag = [+Oopenmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP CXX flag = [-qsmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
-- Try OpenMP CXX flag = [-mp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Failed
CMake Error at /opt/local/share/cmake-3.8/Modules/FindPackageHandleStandardArgs.cmake:137 (message):
Could NOT find OpenMP (missing: OpenMP_C_FLAGS OpenMP_CXX_FLAGS)
Call Stack (most recent call first):
/opt/local/share/cmake-3.8/Modules/FindPackageHandleStandardArgs.cmake:377 (_FPHSA_FAILURE_MESSAGE)
/opt/local/share/cmake-3.8/Modules/FindOpenMP.cmake:316 (find_package_handle_standard_args)
CMakeLists.txt:14 (find_package)

-- Configuring incomplete, errors occurred!
See also "/Users/okaylens-ares/Documents/eBooks/Computer Vision/Mastering OpenCV/code-master/CH4/build/CMakeFiles/CMakeOutput.log".
See also "/Users/okaylens-ares/Documents/eBooks/Computer Vision/Mastering OpenCV/code-master/CH4/build/CMakeFiles/CMakeError.log".

Does anyone know about this issue, thanks.