OPEN CV iOS installation

Question

I am installing the opencv in my system followings the command given by open cv http://docs.opencv.org/2.4/doc/tutorials/introduction/ios_install/ios_install.html I am getting this error Please let me know what I am missing.

anil-Mac-2s-Mac-mini:opencv pws-mac-2$ python platforms/ios/build_framework.py ios
Executing: ['cmake', '-GXcode', '-DCMAKE_BUILD_TYPE=Release', '-DCMAKE_TOOLCHAIN_FILE=/Users/pws-mac-2/Desktop/opencv/platforms/ios/cmake/Toolchains/Toolchain-iPhoneOS_Xcode.cmake', '-DCMAKE_INSTALL_PREFIX=install', '-DENABLE_NEON=ON', '/Users/pws-mac-2/Desktop/opencv', '-DCMAKE_C_FLAGS=-fembed-bitcode', '-DCMAKE_CXX_FLAGS=-fembed-bitcode'] in /Users/pws-mac-2/Desktop/opencv/ios/build/armv7-iPhoneOS

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ERROR: [Errno 2] No such file or directory
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Traceback (most recent call last):
File "platforms/ios/build_framework.py", line 183, in <module>
b.build(args.out)
File "platforms/ios/build_framework.py", line 87, in build
self.buildOne(t[0], t[1], mainBD, cmake_flags)
File "platforms/ios/build_framework.py", line 105, in buildOne
execute(cmakecmd, cwd = builddir)
File "platforms/ios/build_framework.py", line 34, in execute
retcode = check_call(cmd, cwd = cwd)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 535, in check_call
retcode = call(*popenargs, **kwargs)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 522, in call
return Popen(*popenargs, **kwargs).wait()
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 710, in __init__
errread, errwrite)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 1335, in _execute_child
raise child_exception
OSError: [Errno 2] No such file or directory

I am getting this error Please let me know how to resolve . . .

Answer 1

This error happens because cmake is either (a) not installed or (b) not on the user's path.

In this case, the OP had downloaded the cmake gui application from cmake.org, and copied it to /Applications. This app doesn't add the path to the binaries automatically, which is why the script couldn't find cmake.

By adding the path to the cmake binaries (bash syntax):

PATH=$PATH:/Applications/CMake.app/Contents/bin

the OP was able to successfully build opencv.

Most package managers - e.g. homebrew or macports whould have automatically added a path to the user's profile that would have permitted it to run without having to modify the path any more.