Cross compile opencv build fails for aarch64 targets

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I'm trying to build OpenCV for aarch64 system and below is my cmake command. Any idea how to resolve this error ?

 gbista@gbista-Precision-7510:~/cods/dl_platform/dpx2/build$ cmake -DSOFTFP=ON -DBUILD_SHARED_LIBS=OFF -DINSTALL_C_EXAMPLES=OFF -DWITH_V4L=OFF  -DCMAKE_C_COMPILER=/usr/bin/aarch64-linux-gnu-gcc -DCMAKE_CXX_COMPILER=/usr/bin/aarch64-linux-gnu-g++ -DCMAKE_TOOLCHAIN_FILE=/home/gbista/cods/dl_platform/dpx2/opensrc/opencv-3.3.0/platforms/linux/aarch64-gnu.toolchain.cmake /home/gbista/cods/dl_platform/dpx2/opensrc/opencv-3.3.0

-- The CXX compiler identification is GNU 4.8.4
-- The C compiler identification is GNU 4.8.4
-- Check for working CXX compiler: /usr/bin/aarch64-linux-gnu-g++
-- Check for working CXX compiler: /usr/bin/aarch64-linux-gnu-g++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Check for working C compiler: /usr/bin/aarch64-linux-gnu-gcc
-- Check for working C compiler: /usr/bin/aarch64-linux-gnu-gcc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Detected version of GNU GCC: 48 (408)
-- Performing Test HAVE_CXX11 (check file: cmake/checks/cxx11.cpp)
-- Performing Test HAVE_CXX11 - Failed
-- Found PythonInterp: /usr/bin/python2.7 (found suitable version "2.7.6", minimum required is "2.7") 
-- Could NOT find PythonLibs (missing:  PYTHON_LIBRARIES PYTHON_INCLUDE_DIRS) (Required is at least version "2.7")
-- Cannot probe for Python/Numpy support (because we are cross-compiling OpenCV)
-- If you want to enable Python/Numpy support, set the following variables:
--   PYTHON2_INCLUDE_PATH
--   PYTHON2_LIBRARIES (optional on Unix-like systems)
--   PYTHON2_NUMPY_INCLUDE_DIRS
--   PYTHON3_INCLUDE_PATH
--   PYTHON3_LIBRARIES (optional on Unix-like systems)
--   PYTHON3_NUMPY_INCLUDE_DIRS
-- Found PythonInterp: /usr/bin/python3.4 (found suitable version "3.4.3", minimum required is "3.4") 
-- Could NOT find PythonLibs (missing:  PYTHON_LIBRARIES PYTHON_INCLUDE_DIRS) (Required is at least version "3.4")
-- Cannot probe for Python/Numpy support (because we are cross-compiling OpenCV)
-- If you want to enable Python/Numpy support, set the following variables:
--   PYTHON2_INCLUDE_PATH
--   PYTHON2_LIBRARIES (optional on Unix-like systems)
--   PYTHON2_NUMPY_INCLUDE_DIRS
--   PYTHON3_INCLUDE_PATH
--   PYTHON3_LIBRARIES (optional on Unix-like systems)
--   PYTHON3_NUMPY_INCLUDE_DIRS
-- Looking for ccache - not found
-- Performing Test HAVE_CXX_FSIGNED_CHAR
-- Performing Test HAVE_CXX_FSIGNED_CHAR - Success
-- Performing Test HAVE_C_FSIGNED_CHAR
-- Performing Test HAVE_C_FSIGNED_CHAR - Success
-- Performing Test HAVE_CXX_W
-- Performing Test HAVE_CXX_W - Success
-- Performing Test HAVE_C_W
-- Performing Test HAVE_C_W - Success
-- Performing Test HAVE_CXX_WALL
-- Performing Test HAVE_CXX_WALL - Success
-- Performing Test HAVE_C_WALL
-- Performing Test HAVE_C_WALL - Success
-- Performing Test HAVE_CXX_WERROR_RETURN_TYPE
-- Performing Test HAVE_CXX_WERROR_RETURN_TYPE - Success
-- Performing Test HAVE_C_WERROR_RETURN_TYPE
-- Performing Test HAVE_C_WERROR_RETURN_TYPE - Success
-- Performing Test HAVE_CXX_WERROR_NON_VIRTUAL_DTOR
-- Performing Test HAVE_CXX_WERROR_NON_VIRTUAL_DTOR - Success
-- Performing Test HAVE_C_WERROR_NON_VIRTUAL_DTOR
-- Performing Test HAVE_C_WERROR_NON_VIRTUAL_DTOR - Success
-- Performing Test HAVE_CXX_WERROR_ADDRESS
-- Performing Test HAVE_CXX_WERROR_ADDRESS - Success
-- Performing Test HAVE_C_WERROR_ADDRESS
-- Performing Test HAVE_C_WERROR_ADDRESS - Success
-- Performing Test HAVE_CXX_WERROR_SEQUENCE_POINT
-- Performing Test HAVE_CXX_WERROR_SEQUENCE_POINT - Success
-- Performing Test HAVE_C_WERROR_SEQUENCE_POINT
-- Performing Test HAVE_C_WERROR_SEQUENCE_POINT - Success
-- Performing Test HAVE_CXX_WFORMAT
-- Performing Test HAVE_CXX_WFORMAT - Success
-- Performing Test HAVE_C_WFORMAT
-- Performing Test HAVE_C_WFORMAT - Success
-- Performing Test HAVE_CXX_WERROR_FORMAT_SECURITY
-- Performing Test HAVE_CXX_WERROR_FORMAT_SECURITY - Success
-- Performing Test HAVE_C_WERROR_FORMAT_SECURITY
-- Performing Test HAVE_C_WERROR_FORMAT_SECURITY - Success
-- Performing Test HAVE_CXX_WMISSING_DECLARATIONS
-- Performing Test HAVE_CXX_WMISSING_DECLARATIONS - Success
-- Performing Test HAVE_C_WMISSING_DECLARATIONS
-- Performing Test HAVE_C_WMISSING_DECLARATIONS - Success
-- Performing Test HAVE_CXX_WMISSING_PROTOTYPES
-- Performing Test HAVE_CXX_WMISSING_PROTOTYPES - Failed
-- Performing Test HAVE_C_WMISSING_PROTOTYPES
-- Performing Test HAVE_C_WMISSING_PROTOTYPES - Success
-- Performing Test HAVE_CXX_WSTRICT_PROTOTYPES
-- Performing Test HAVE_CXX_WSTRICT_PROTOTYPES - Failed
-- Performing Test HAVE_C_WSTRICT_PROTOTYPES
-- Performing Test HAVE_C_WSTRICT_PROTOTYPES - Success
-- Performing Test HAVE_CXX_WUNDEF
-- Performing Test HAVE_CXX_WUNDEF - Success
-- Performing Test HAVE_C_WUNDEF ...