Failed to build cryptography in OS X

[priyankt68]

I follow the documentation and executed the commands required for OS X. I have created and activated a virtualenv with the name of caravel and installing cryptography within it. I am unable to build cryptography package. Following are the error logs that I am receiving.

Failed building wheel for cryptography
Failed to build cryptography
Installing collected packages: idna, pyasn1, six, enum34, ipaddress, pycparser, cffi, cryptography
Running setup.py install for cryptography
Complete output from command /Users/priyanktrivedi/development/caravel/bin/python2.7 -c "import setuptools, tokenize;file='/private/var/folders/60/11qs
tkk57k3858vdl52ft4jc0000gn/T/pip-build-SZIt74/cryptography/setup.py';exec(compile(getattr(tokenize, 'open', open)(file).read().replace('\r\n', '\n'), file, 'exec'))" install --record /var/folders/60/11qstkk57k3858vdl52ft4jc0000gn/T/pip-GsbdNx-record/install-record.txt --single-version-externally-managed --co$pile --install-headers /Users/priyanktrivedi/development/caravel/bin/../include/site/python2.7/cryptography:
running install
running build
running build_py
running egg_info
writing requirements to src/cryptography.egg-info/requires.txt
writing src/cryptography.egg-info/PKG-INFO
writing top-level names to src/cryptography.egg-info/top_level.txt
writing dependency_links to src/cryptography.egg-info/dependency_links.txt
writing entry points to src/cryptography.egg-info/entry_points.txt
warning: manifest_maker: standard file '-c' not found
reading manifest file 'src/cryptography.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
no previously-included directories found matching 'docs/_build'
warning: no previously-included files matching '*' found under directory 'vectors'
writing manifest file 'src/cryptography.egg-info/SOURCES.txt'
running build_ext
generating cffi module 'build/temp.macosx-10.10-x86_64-2.7/_commoncrypto.c'
already up-to-date
generating cffi module 'build/temp.macosx-10.10-x86_64-2.7/_padding.c'
already up-to-date
generating cffi module 'build/temp.macosx-10.10-x86_64-2.7/_constant_time.c'
already up-to-date
generating cffi module 'build/temp.macosx-10.10-x86_64-2.7/_openssl.c'
already up-to-date
building '_commoncrypto' extension
/usr/local/bin/gcc -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -I/usr/local/opt/openssl/include -I/usr/local/Cellar/python/2.7.11/Frameworks/Python.$ramework/Versions/2.7/include/python2.7 -c build/temp.macosx-10.10-x86_64-2.7/_commoncrypto.c -o build/temp.macosx-10.10-x86_64-2.7/build/temp.macosx-10.10-x8$_64-2.7/_commoncrypto.o
In file included from /usr/include/dispatch/dispatch.h:51:0,
from /System/Library/Frameworks/CoreFoundation.framework/Headers/CFStream.h:15,
from /System/Library/Frameworks/CoreFoundation.framework/Headers/CFPropertyList.h:13,
from /System/Library/Frameworks/CoreFoundation.framework/Headers/CoreFoundation.h:55,
from build/temp.macosx-10.10-x86_64-2.7/_commoncrypto.c:424:
/usr/include/dispatch/object.h:143:15: error: expected identifier or '(' before '^' token
typedef void (^dispatch_block_t)(void);
^
/usr/include/dispatch/object.h:362:3: error: unknown type name 'dispatch_block_t'
dispatch_block_t notification_block);
^
In file included from /System/Library/Frameworks/Security.framework/Headers/SecDigestTransform.h:28:0,
from build/temp.macosx-10.10-x86_64-2.7/_commoncrypto.c:460:
/System/Library/Frameworks/Security.framework/Headers/SecTransform.h:579:15: error: expected identifier or '(' before '^' token
typedef void (^SecMessageBlock)(CFTypeRef message, CFErrorRef error,
/System/Library/Frameworks/Security.framework/Headers/SecTransform.h:612:8: error: unknown type name 'SecMessageBlock'
SecMessageBlock deliveryBlock)
^
error: command '/usr/local/bin/gcc' failed with exit status 1

[andrewhn]

Try CC=clang pip install cryptography?

[priyankt68]

Thanks @andrewhn . That worked.