Centos system gives below Error: 

 sudo pip install -U ansible
Collecting ansible
  Using cached ansible-2.1.2.0.tar.gz
Collecting paramiko (from ansible)
  Using cached paramiko-2.0.2-py2.py3-none-any.whl
Collecting jinja2 (from ansible)
  Using cached Jinja2-2.8-py2.py3-none-any.whl
Collecting PyYAML (from ansible)
  Using cached PyYAML-3.12.tar.gz
Collecting setuptools (from ansible)
  Using cached setuptools-28.3.0-py2.py3-none-any.whl
Collecting pycrypto>=2.6 (from ansible)
  Using cached pycrypto-2.6.1.tar.gz
Collecting cryptography>=1.1 (from paramiko->ansible)
  Using cached cryptography-1.5.2.tar.gz
Collecting pyasn1>=0.1.7 (from paramiko->ansible)
  Using cached pyasn1-0.1.9-py2.py3-none-any.whl
Collecting MarkupSafe (from jinja2->ansible)
  Using cached MarkupSafe-0.23.tar.gz
Collecting idna>=2.0 (from cryptography>=1.1->paramiko->ansible)
  Using cached idna-2.1-py2.py3-none-any.whl
Collecting six>=1.4.1 (from cryptography>=1.1->paramiko->ansible)
  Using cached six-1.10.0-py2.py3-none-any.whl
Collecting enum34 (from cryptography>=1.1->paramiko->ansible)
  Using cached enum34-1.1.6-py2-none-any.whl
Collecting ipaddress (from cryptography>=1.1->paramiko->ansible)
  Using cached ipaddress-1.0.17-py2-none-any.whl
Collecting cffi>=1.4.1 (from cryptography>=1.1->paramiko->ansible)
  Downloading cffi-1.8.3-cp27-cp27mu-manylinux1_x86_64.whl (386kB)
    100% |████████████████████████████████| 389kB 425kB/s 
Collecting pycparser (from cffi>=1.4.1->cryptography>=1.1->paramiko->ansible)
  Downloading pycparser-2.14.tar.gz (223kB)
    100% |████████████████████████████████| 225kB 405kB/s 
Building wheels for collected packages: ansible, PyYAML, pycrypto, cryptography, MarkupSafe, pycparser
  Running setup.py bdist_wheel for ansible ... done
  Stored in directory: /root/.cache/pip/wheels/a1/2c/13/24f5a47fdbcfc4ab3d375164150a5db05c409d9c2b5ca65251
  Running setup.py bdist_wheel for PyYAML ... done
  Stored in directory: /root/.cache/pip/wheels/2c/f7/79/13f3a12cd723892437c0cfbde1230ab4d82947ff7b3839a4fc
  Running setup.py bdist_wheel for pycrypto ... error
  Complete output from command /usr/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-pQRuDh/pycrypto/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" bdist_wheel -d /tmp/tmpfm2swvpip-wheel- --python-tag cp27:
  running bdist_wheel
  running build
  running build_py
  creating build
  creating build/lib.linux-x86_64-2.7
  creating build/lib.linux-x86_64-2.7/Crypto
  copying lib/Crypto/pct_warnings.py -> build/lib.linux-x86_64-2.7/Crypto
  copying lib/Crypto/__init__.py -> build/lib.linux-x86_64-2.7/Crypto
  creating build/lib.linux-x86_64-2.7/Crypto/Hash
  copying lib/Crypto/Hash/hashalgo.py -> build/lib.linux-x86_64-2.7/Crypto/Hash
  copying lib/Crypto/Hash/MD2.py -> build/lib.linux-x86_64-2.7/Crypto/Hash
  copying lib/Crypto/Hash/HMAC.py -> build/lib.linux-x86_64-2.7/Crypto/Hash
  copying lib/Crypto/Hash/SHA384.py -> build/lib.linux-x86_64-2.7/Crypto/Hash
  copying lib/Crypto/Hash/RIPEMD.py -> build/lib.linux-x86_64-2.7/Crypto/Hash
  copying lib/Crypto/Hash/SHA256.py -> build/lib.linux-x86_64-2.7/Crypto/Hash
  copying lib/Crypto/Hash/__init__.py -> build/lib.linux-x86_64-2.7/Crypto/Hash
  copying lib/Crypto/Hash/SHA512.py -> build/lib.linux-x86_64-2.7/Crypto/Hash
  copying lib/Crypto/Hash/SHA224.py -> build/lib.linux-x86_64-2.7/Crypto/Hash
  copying lib/Crypto/Hash/MD4.py -> build/lib.linux-x86_64-2.7/Crypto/Hash
  copying lib/Crypto/Hash/MD5.py -> build/lib.linux-x86_64-2.7/Crypto/Hash
  copying lib/Crypto/Hash/SHA.py -> build/lib.linux-x86_64-2.7/Crypto/Hash
  creating build/lib.linux-x86_64-2.7/Crypto/Cipher
  copying lib/Crypto/Cipher/XOR.py -> build/lib.linux-x86_64-2.7/Crypto/Cipher
  copying lib/Crypto/Cipher/Blowfish.py -> build/lib.linux-x86_64-2.7/Crypto/Cipher
  copying lib/Crypto/Cipher/DES.py -> build/lib.linux-x86_64-2.7/Crypto/Cipher
  copying lib/Crypto/Cipher/AES.py -> build/lib.linux-x86_64-2.7/Crypto/Cipher
  copying lib/Crypto/Cipher/CAST.py -> build/lib.linux-x86_64-2.7/Crypto/Cipher
  copying lib/Crypto/Cipher/blockalgo.py -> build/lib.linux-x86_64-2.7/Crypto/Cipher
  copying lib/Crypto/Cipher/DES3.py -> build/lib.linux-x86_64-2.7/Crypto/Cipher
  copying lib/Crypto/Cipher/PKCS1_OAEP.py -> build/lib.linux-x86_64-2.7/Crypto/Cipher
  copying lib/Crypto/Cipher/__init__.py -> build/lib.linux-x86_64-2.7/Crypto/Cipher
  copying lib/Crypto/Cipher/ARC4.py -> build/lib.linux-x86_64-2.7/Crypto/Cipher
  copying lib/Crypto/Cipher/PKCS1_v1_5.py -> build/lib.linux-x86_64-2.7/Crypto/Cipher
  copying lib/Crypto/Cipher/ARC2.py -> build/lib.linux-x86_64-2.7/Crypto/Cipher
  creating build/lib.linux-x86_64-2.7/Crypto/Util
  copying lib/Crypto/Util/randpool.py -> build/lib.linux-x86_64-2.7/Crypto/Util
  copying lib/Crypto/Util/asn1.py -> build/lib.linux-x86_64-2.7/Crypto/Util
  copying lib/Crypto/Util/_number_new.py -> build/lib.linux-x86_64-2.7/Crypto/Util
  copying lib/Crypto/Util/RFC1751.py -> build/lib.linux-x86_64-2.7/Crypto/Util
  copying lib/Crypto/Util/winrandom.py -> build/lib.linux-x86_64-2.7/Crypto/Util
  copying lib/Crypto/Util/py21compat.py -> build/lib.linux-x86_64-2.7/Crypto/Util
  copying lib/Crypto/Util/py3compat.py -> build/lib.linux-x86_64-2.7/Crypto/Util
  copying lib/Crypto/Util/Counter.py -> build/lib.linux-x86_64-2.7/Crypto/Util
  copying lib/Crypto/Util/__init__.py -> build/lib.linux-x86_64-2.7/Crypto/Util
  copying lib/Crypto/Util/number.py -> build/lib.linux-x86_64-2.7/Crypto/Util
  creating build/lib.linux-x86_64-2.7/Crypto/Random
  copying lib/Crypto/Random/random.py -> build/lib.linux-x86_64-2.7/Crypto/Random
  copying lib/Crypto/Random/_UserFriendlyRNG.py -> build/lib.linux-x86_64-2.7/Crypto/Random
  copying lib/Crypto/Random/__init__.py -> build/lib.linux-x86_64-2.7/Crypto/Random
  creating build/lib.linux-x86_64-2.7/Crypto/Random/Fortuna
  copying lib/Crypto/Random/Fortuna/FortunaAccumulator.py -> build/lib.linux-x86_64-2.7/Crypto/Random/Fortuna
  copying lib/Crypto/Random/Fortuna/FortunaGenerator.py -> build/lib.linux-x86_64-2.7/Crypto/Random/Fortuna
  copying lib/Crypto/Random/Fortuna/SHAd256.py -> build/lib.linux-x86_64-2.7/Crypto/Random/Fortuna
  copying lib/Crypto/Random/Fortuna/__init__.py -> build/lib.linux-x86_64-2.7/Crypto/Random/Fortuna
  creating build/lib.linux-x86_64-2.7/Crypto/Random/OSRNG
  copying lib/Crypto/Random/OSRNG/fallback.py -> build/lib.linux-x86_64-2.7/Crypto/Random/OSRNG
  copying lib/Crypto/Random/OSRNG/nt.py -> build/lib.linux-x86_64-2.7/Crypto/Random/OSRNG
  copying lib/Crypto/Random/OSRNG/__init__.py -> build/lib.linux-x86_64-2.7/Crypto/Random/OSRNG
  copying lib/Crypto/Random/OSRNG/rng_base.py -> build/lib.linux-x86_64-2.7/Crypto/Random/OSRNG
  copying lib/Crypto/Random/OSRNG/posix.py -> build/lib.linux-x86_64-2.7/Crypto/Random/OSRNG
  creating build/lib.linux-x86_64-2.7/Crypto/SelfTest
  copying lib/Crypto/SelfTest/st_common.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest
  copying lib/Crypto/SelfTest/__init__.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest
  creating build/lib.linux-x86_64-2.7/Crypto/SelfTest/Cipher
  copying lib/Crypto/SelfTest/Cipher/test_DES3.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Cipher
  copying lib/Crypto/SelfTest/Cipher/test_CAST.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Cipher
  copying lib/Crypto/SelfTest/Cipher/common.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Cipher
  copying lib/Crypto/SelfTest/Cipher/test_pkcs1_oaep.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Cipher
  copying lib/Crypto/SelfTest/Cipher/test_XOR.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Cipher
  copying lib/Crypto/SelfTest/Cipher/test_pkcs1_15.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Cipher
  copying lib/Crypto/SelfTest/Cipher/test_Blowfish.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Cipher
  copying lib/Crypto/SelfTest/Cipher/__init__.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Cipher
  copying lib/Crypto/SelfTest/Cipher/test_ARC4.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Cipher
  copying lib/Crypto/SelfTest/Cipher/test_AES.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Cipher
  copying lib/Crypto/SelfTest/Cipher/test_ARC2.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Cipher
  copying lib/Crypto/SelfTest/Cipher/test_DES.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Cipher
  creating build/lib.linux-x86_64-2.7/Crypto/SelfTest/Hash
  copying lib/Crypto/SelfTest/Hash/test_MD4.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Hash
  copying lib/Crypto/SelfTest/Hash/common.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Hash
  copying lib/Crypto/SelfTest/Hash/test_SHA256.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Hash
  copying lib/Crypto/SelfTest/Hash/test_MD2.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Hash
  copying lib/Crypto/SelfTest/Hash/test_SHA512.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Hash
  copying lib/Crypto/SelfTest/Hash/test_SHA224.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Hash
  copying lib/Crypto/SelfTest/Hash/__init__.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Hash
  copying lib/Crypto/SelfTest/Hash/test_HMAC.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Hash
  copying lib/Crypto/SelfTest/Hash/test_RIPEMD.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Hash
  copying lib/Crypto/SelfTest/Hash/test_SHA.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Hash
  copying lib/Crypto/SelfTest/Hash/test_SHA384.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Hash
  copying lib/Crypto/SelfTest/Hash/test_MD5.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Hash
  creating build/lib.linux-x86_64-2.7/Crypto/SelfTest/Protocol
  copying lib/Crypto/SelfTest/Protocol/test_KDF.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Protocol
  copying lib/Crypto/SelfTest/Protocol/test_rfc1751.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Protocol
  copying lib/Crypto/SelfTest/Protocol/test_chaffing.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Protocol
  copying lib/Crypto/SelfTest/Protocol/__init__.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Protocol
  copying lib/Crypto/SelfTest/Protocol/test_AllOrNothing.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Protocol
  creating build/lib.linux-x86_64-2.7/Crypto/SelfTest/PublicKey
  copying lib/Crypto/SelfTest/PublicKey/test_DSA.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/PublicKey
  copying lib/Crypto/SelfTest/PublicKey/test_importKey.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/PublicKey
  copying lib/Crypto/SelfTest/PublicKey/test_RSA.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/PublicKey
  copying lib/Crypto/SelfTest/PublicKey/test_ElGamal.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/PublicKey
  copying lib/Crypto/SelfTest/PublicKey/__init__.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/PublicKey
  creating build/lib.linux-x86_64-2.7/Crypto/SelfTest/Random
  copying lib/Crypto/SelfTest/Random/test__UserFriendlyRNG.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Random
  copying lib/Crypto/SelfTest/Random/test_rpoolcompat.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Random
  copying lib/Crypto/SelfTest/Random/__init__.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Random
  copying lib/Crypto/SelfTest/Random/test_random.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Random
  creating build/lib.linux-x86_64-2.7/Crypto/SelfTest/Random/Fortuna
  copying lib/Crypto/SelfTest/Random/Fortuna/test_SHAd256.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Random/Fortuna
  copying lib/Crypto/SelfTest/Random/Fortuna/__init__.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Random/Fortuna
  copying lib/Crypto/SelfTest/Random/Fortuna/test_FortunaAccumulator.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Random/Fortuna
  copying lib/Crypto/SelfTest/Random/Fortuna/test_FortunaGenerator.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Random/Fortuna
  creating build/lib.linux-x86_64-2.7/Crypto/SelfTest/Random/OSRNG
  copying lib/Crypto/SelfTest/Random/OSRNG/test_nt.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Random/OSRNG
  copying lib/Crypto/SelfTest/Random/OSRNG/test_posix.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Random/OSRNG
  copying lib/Crypto/SelfTest/Random/OSRNG/test_winrandom.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Random/OSRNG
  copying lib/Crypto/SelfTest/Random/OSRNG/test_fallback.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Random/OSRNG
  copying lib/Crypto/SelfTest/Random/OSRNG/__init__.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Random/OSRNG
  copying lib/Crypto/SelfTest/Random/OSRNG/test_generic.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Random/OSRNG
  creating build/lib.linux-x86_64-2.7/Crypto/SelfTest/Util
  copying lib/Crypto/SelfTest/Util/test_asn1.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Util
  copying lib/Crypto/SelfTest/Util/test_winrandom.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Util
  copying lib/Crypto/SelfTest/Util/__init__.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Util
  copying lib/Crypto/SelfTest/Util/test_Counter.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Util
  copying lib/Crypto/SelfTest/Util/test_number.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Util
  creating build/lib.linux-x86_64-2.7/Crypto/SelfTest/Signature
  copying lib/Crypto/SelfTest/Signature/test_pkcs1_pss.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Signature
  copying lib/Crypto/SelfTest/Signature/test_pkcs1_15.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Signature
  copying lib/Crypto/SelfTest/Signature/__init__.py -> build/lib.linux-x86_64-2.7/Crypto/SelfTest/Signature
  creating build/lib.linux-x86_64-2.7/Crypto/Protocol
  copying lib/Crypto/Protocol/KDF.py -> build/lib.linux-x86_64-2.7/Crypto/Protocol
  copying lib/Crypto/Protocol/AllOrNothing.py -> build/lib.linux-x86_64-2.7/Crypto/Protocol
  copying lib/Crypto/Protocol/Chaffing.py -> build/lib.linux-x86_64-2.7/Crypto/Protocol
  copying lib/Crypto/Protocol/__init__.py -> build/lib.linux-x86_64-2.7/Crypto/Protocol
  creating build/lib.linux-x86_64-2.7/Crypto/PublicKey
  copying lib/Crypto/PublicKey/_DSA.py -> build/lib.linux-x86_64-2.7/Crypto/PublicKey
  copying lib/Crypto/PublicKey/pubkey.py -> build/lib.linux-x86_64-2.7/Crypto/PublicKey
  copying lib/Crypto/PublicKey/ElGamal.py -> build/lib.linux-x86_64-2.7/Crypto/PublicKey
  copying lib/Crypto/PublicKey/RSA.py -> build/lib.linux-x86_64-2.7/Crypto/PublicKey
  copying lib/Crypto/PublicKey/_RSA.py -> build/lib.linux-x86_64-2.7/Crypto/PublicKey
  copying lib/Crypto/PublicKey/__init__.py -> build/lib.linux-x86_64-2.7/Crypto/PublicKey
  copying lib/Crypto/PublicKey/DSA.py -> build/lib.linux-x86_64-2.7/Crypto/PublicKey
  copying lib/Crypto/PublicKey/_slowmath.py -> build/lib.linux-x86_64-2.7/Crypto/PublicKey
  creating build/lib.linux-x86_64-2.7/Crypto/Signature
  copying lib/Crypto/Signature/PKCS1_PSS.py -> build/lib.linux-x86_64-2.7/Crypto/Signature
  copying lib/Crypto/Signature/__init__.py -> build/lib.linux-x86_64-2.7/Crypto/Signature
  copying lib/Crypto/Signature/PKCS1_v1_5.py -> build/lib.linux-x86_64-2.7/Crypto/Signature
  running build_ext
  running build_configure
  checking for gcc... no
  checking for cc... no
  checking for cl.exe... no
  configure: error: in `/tmp/pip-build-pQRuDh/pycrypto':
  configure: error: no acceptable C compiler found in $PATH
  See `config.log' for more details
  Traceback (most recent call last):
    File "<string>", line 1, in <module>
    File "/tmp/pip-build-pQRuDh/pycrypto/setup.py", line 456, in <module>
      core.setup(**kw)
    File "/usr/lib64/python2.7/distutils/core.py", line 152, in setup
      dist.run_commands()
    File "/usr/lib64/python2.7/distutils/dist.py", line 953, in run_commands
      self.run_command(cmd)
    File "/usr/lib64/python2.7/distutils/dist.py", line 972, in run_command
      cmd_obj.run()
    File "/usr/lib/python2.7/site-packages/wheel/bdist_wheel.py", line 175, in run
      self.run_command('build')
    File "/usr/lib64/python2.7/distutils/cmd.py", line 326, in run_command
      self.distribution.run_command(command)
    File "/usr/lib64/python2.7/distutils/dist.py", line 972, in run_command
      cmd_obj.run()
    File "/usr/lib64/python2.7/distutils/command/build.py", line 127, in run
      self.run_command(cmd_name)
    File "/usr/lib64/python2.7/distutils/cmd.py", line 326, in run_command
      self.distribution.run_command(command)
    File "/usr/lib64/python2.7/distutils/dist.py", line 972, in run_command
      cmd_obj.run()
    File "/tmp/pip-build-pQRuDh/pycrypto/setup.py", line 251, in run
      self.run_command(cmd_name)
    File "/usr/lib64/python2.7/distutils/cmd.py", line 326, in run_command
      self.distribution.run_command(command)
    File "/usr/lib64/python2.7/distutils/dist.py", line 972, in run_command
      cmd_obj.run()
    File "/tmp/pip-build-pQRuDh/pycrypto/setup.py", line 278, in run
      raise RuntimeError("autoconf error")
  RuntimeError: autoconf error
  
  ----------------------------------------
  Failed building wheel for pycrypto
  Running setup.py clean for pycrypto
  Running setup.py bdist_wheel for cryptography ... error
  Complete output from command /usr/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-pQRuDh/cryptography/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" bdist_wheel -d /tmp/tmpkCpEPPpip-wheel- --python-tag cp27:
  Package libffi was not found in the pkg-config search path.
  Perhaps you should add the directory containing `libffi.pc'
  to the PKG_CONFIG_PATH environment variable
  No package 'libffi' found
  Package libffi was not found in the pkg-config search path.
  Perhaps you should add the directory containing `libffi.pc'
  to the PKG_CONFIG_PATH environment variable
  No package 'libffi' found
  Package libffi was not found in the pkg-config search path.
  Perhaps you should add the directory containing `libffi.pc'
  to the PKG_CONFIG_PATH environment variable
  No package 'libffi' found
  Package libffi was not found in the pkg-config search path.
  Perhaps you should add the directory containing `libffi.pc'
  to the PKG_CONFIG_PATH environment variable
  No package 'libffi' found
  Package libffi was not found in the pkg-config search path.
  Perhaps you should add the directory containing `libffi.pc'
  to the PKG_CONFIG_PATH environment variable
  No package 'libffi' found
  unable to execute gcc: No such file or directory
  unable to execute gcc: No such file or directory
  
      No working compiler found, or bogus compiler options
      passed to the compiler from Python's distutils module.
      See the error messages above.
      (If they are about -mno-fused-madd and you are on OS/X 10.8,
      see http://stackoverflow.com/questions/22313407/ .)
  Traceback (most recent call last):
    File "<string>", line 1, in <module>
    File "/tmp/pip-build-pQRuDh/cryptography/setup.py", line 334, in <module>
      **keywords_with_side_effects(sys.argv)
    File "/usr/lib64/python2.7/distutils/core.py", line 112, in setup
      _setup_distribution = dist = klass(attrs)
    File "/usr/lib/python2.7/site-packages/setuptools/dist.py", line 265, in __init__
      self.fetch_build_eggs(attrs.pop('setup_requires'))
    File "/usr/lib/python2.7/site-packages/setuptools/dist.py", line 289, in fetch_build_eggs
      parse_requirements(requires), installer=self.fetch_build_egg
    File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 618, in resolve
      dist = best[req.key] = env.best_match(req, self, installer)
    File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 862, in best_match
      return self.obtain(req, installer) # try and download/install
    File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 874, in obtain
      return installer(requirement)
    File "/usr/lib/python2.7/site-packages/setuptools/dist.py", line 339, in fetch_build_egg
      return cmd.easy_install(req)
    File "/usr/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 623, in easy_install
      return self.install_item(spec, dist.location, tmpdir, deps)
    File "/usr/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 653, in install_item
      dists = self.install_eggs(spec, download, tmpdir)
    File "/usr/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 849, in install_eggs
      return self.build_and_install(setup_script, setup_base)
    File "/usr/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 1130, in build_and_install
      self.run_setup(setup_script, setup_base, args)
    File "/usr/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 1118, in run_setup
      raise DistutilsError("Setup script exited with %s" % (v.args[0],))
  distutils.errors.DistutilsError: Setup script exited with 1
  
  ----------------------------------------
  Failed building wheel for cryptography
  Running setup.py clean for cryptography
  Complete output from command /usr/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-pQRuDh/cryptography/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" clean --all:
  Package libffi was not found in the pkg-config search path.
  Perhaps you should add the directory containing `libffi.pc'
  to the PKG_CONFIG_PATH environment variable
  No package 'libffi' found
  Package libffi was not found in the pkg-config search path.
  Perhaps you should add the directory containing `libffi.pc'
  to the PKG_CONFIG_PATH environment variable
  No package 'libffi' found
  Package libffi was not found in the pkg-config search path.
  Perhaps you should add the directory containing `libffi.pc'
  to the PKG_CONFIG_PATH environment variable
  No package 'libffi' found
  Package libffi was not found in the pkg-config search path.
  Perhaps you should add the directory containing `libffi.pc'
  to the PKG_CONFIG_PATH environment variable
  No package 'libffi' found
  Package libffi was not found in the pkg-config search path.
  Perhaps you should add the directory containing `libffi.pc'
  to the PKG_CONFIG_PATH environment variable
  No package 'libffi' found
  unable to execute gcc: No such file or directory
  unable to execute gcc: No such file or directory
  
      No working compiler found, or bogus compiler options
      passed to the compiler from Python's distutils module.
      See the error messages above.
      (If they are about -mno-fused-madd and you are on OS/X 10.8,
      see http://stackoverflow.com/questions/22313407/ .)
  Traceback (most recent call last):
    File "<string>", line 1, in <module>
    File "/tmp/pip-build-pQRuDh/cryptography/setup.py", line 334, in <module>
      **keywords_with_side_effects(sys.argv)
    File "/usr/lib64/python2.7/distutils/core.py", line 112, in setup
      _setup_distribution = dist = klass(attrs)
    File "/usr/lib/python2.7/site-packages/setuptools/dist.py", line 265, in __init__
      self.fetch_build_eggs(attrs.pop('setup_requires'))
    File "/usr/lib/python2.7/site-packages/setuptools/dist.py", line 289, in fetch_build_eggs
      parse_requirements(requires), installer=self.fetch_build_egg
    File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 618, in resolve
      dist = best[req.key] = env.best_match(req, self, installer)
    File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 862, in best_match
      return self.obtain(req, installer) # try and download/install
    File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 874, in obtain
      return installer(requirement)
    File "/usr/lib/python2.7/site-packages/setuptools/dist.py", line 339, in fetch_build_egg
      return cmd.easy_install(req)
    File "/usr/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 623, in easy_install
      return self.install_item(spec, dist.location, tmpdir, deps)
    File "/usr/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 653, in install_item
      dists = self.install_eggs(spec, download, tmpdir)
    File "/usr/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 849, in install_eggs
      return self.build_and_install(setup_script, setup_base)
    File "/usr/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 1130, in build_and_install
      self.run_setup(setup_script, setup_base, args)
    File "/usr/lib/python2.7/site-packages/setuptools/command/easy_install.py", line 1118, in run_setup
      raise DistutilsError("Setup script exited with %s" % (v.args[0],))
  distutils.errors.DistutilsError: Setup script exited with 1
  
  ----------------------------------------
  Failed cleaning build dir for cryptography
  Running setup.py bdist_wheel for MarkupSafe ... done
  Stored in directory: /root/.cache/pip/wheels/a3/fa/dc/0198eed9ad95489b8a4f45d14dd5d2aee3f8984e46862c5748
  Running setup.py bdist_wheel for pycparser ... done
  Stored in directory: /root/.cache/pip/wheels/9b/f4/2e/d03e949a551719a1ffcb659f2c63d8444f4df12e994ce52112
Successfully built ansible PyYAML MarkupSafe pycparser
Failed to build pycrypto cryptography
Installing collected packages: idna, pyasn1, six, setuptools, enum34, ipaddress, pycparser, cffi, cryptography, paramiko, MarkupSafe, jinja2, PyYAML, pycrypto, ansible
  Found existing installation: setuptools 0.9.8
    Uninstalling setuptools-0.9.8:
      Successfully uninstalled setuptools-0.9.8
  Running setup.py install for cryptography ... error
    Complete output from command /usr/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-pQRuDh/cryptography/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-IWacHN-record/install-record.txt --single-version-externally-managed --compile:
    running install
    running build
    running build_py
    creating build
    creating build/lib.linux-x86_64-2.7
    creating build/lib.linux-x86_64-2.7/cryptography
    copying src/cryptography/__about__.py -> build/lib.linux-x86_64-2.7/cryptography
    copying src/cryptography/fernet.py -> build/lib.linux-x86_64-2.7/cryptography
    copying src/cryptography/utils.py -> build/lib.linux-x86_64-2.7/cryptography
    copying src/cryptography/__init__.py -> build/lib.linux-x86_64-2.7/cryptography
    copying src/cryptography/exceptions.py -> build/lib.linux-x86_64-2.7/cryptography
    creating build/lib.linux-x86_64-2.7/cryptography/x509
    copying src/cryptography/x509/extensions.py -> build/lib.linux-x86_64-2.7/cryptography/x509
    copying src/cryptography/x509/name.py -> build/lib.linux-x86_64-2.7/cryptography/x509
    copying src/cryptography/x509/__init__.py -> build/lib.linux-x86_64-2.7/cryptography/x509
    copying src/cryptography/x509/oid.py -> build/lib.linux-x86_64-2.7/cryptography/x509
    copying src/cryptography/x509/general_name.py -> build/lib.linux-x86_64-2.7/cryptography/x509
    copying src/cryptography/x509/base.py -> build/lib.linux-x86_64-2.7/cryptography/x509
    creating build/lib.linux-x86_64-2.7/cryptography/hazmat
    copying src/cryptography/hazmat/__init__.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat
    creating build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives
    copying src/cryptography/hazmat/primitives/hmac.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives
    copying src/cryptography/hazmat/primitives/hashes.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives
    copying src/cryptography/hazmat/primitives/cmac.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives
    copying src/cryptography/hazmat/primitives/__init__.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives
    copying src/cryptography/hazmat/primitives/keywrap.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives
    copying src/cryptography/hazmat/primitives/padding.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives
    copying src/cryptography/hazmat/primitives/serialization.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives
    copying src/cryptography/hazmat/primitives/constant_time.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives
    creating build/lib.linux-x86_64-2.7/cryptography/hazmat/backends
    copying src/cryptography/hazmat/backends/multibackend.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/backends
    copying src/cryptography/hazmat/backends/__init__.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/backends
    copying src/cryptography/hazmat/backends/interfaces.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/backends
    creating build/lib.linux-x86_64-2.7/cryptography/hazmat/bindings
    copying src/cryptography/hazmat/bindings/__init__.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/bindings
    creating build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives/twofactor
    copying src/cryptography/hazmat/primitives/twofactor/utils.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives/twofactor
    copying src/cryptography/hazmat/primitives/twofactor/__init__.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives/twofactor
    copying src/cryptography/hazmat/primitives/twofactor/hotp.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives/twofactor
    copying src/cryptography/hazmat/primitives/twofactor/totp.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives/twofactor
    creating build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives/asymmetric
    copying src/cryptography/hazmat/primitives/asymmetric/rsa.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives/asymmetric
    copying src/cryptography/hazmat/primitives/asymmetric/dsa.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives/asymmetric
    copying src/cryptography/hazmat/primitives/asymmetric/utils.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives/asymmetric
    copying src/cryptography/hazmat/primitives/asymmetric/__init__.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives/asymmetric
    copying src/cryptography/hazmat/primitives/asymmetric/ec.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives/asymmetric
    copying src/cryptography/hazmat/primitives/asymmetric/padding.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives/asymmetric
    copying src/cryptography/hazmat/primitives/asymmetric/dh.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives/asymmetric
    creating build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives/ciphers
    copying src/cryptography/hazmat/primitives/ciphers/algorithms.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives/ciphers
    copying src/cryptography/hazmat/primitives/ciphers/__init__.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives/ciphers
    copying src/cryptography/hazmat/primitives/ciphers/modes.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives/ciphers
    copying src/cryptography/hazmat/primitives/ciphers/base.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives/ciphers
    creating build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives/interfaces
    copying src/cryptography/hazmat/primitives/interfaces/__init__.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives/interfaces
    creating build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives/kdf
    copying src/cryptography/hazmat/primitives/kdf/concatkdf.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives/kdf
    copying src/cryptography/hazmat/primitives/kdf/kbkdf.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives/kdf
    copying src/cryptography/hazmat/primitives/kdf/hkdf.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives/kdf
    copying src/cryptography/hazmat/primitives/kdf/__init__.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives/kdf
    copying src/cryptography/hazmat/primitives/kdf/x963kdf.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives/kdf
    copying src/cryptography/hazmat/primitives/kdf/pbkdf2.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives/kdf
    creating build/lib.linux-x86_64-2.7/cryptography/hazmat/backends/openssl
    copying src/cryptography/hazmat/backends/openssl/hmac.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/backends/openssl
    copying src/cryptography/hazmat/backends/openssl/encode_asn1.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/backends/openssl
    copying src/cryptography/hazmat/backends/openssl/rsa.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/backends/openssl
    copying src/cryptography/hazmat/backends/openssl/dsa.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/backends/openssl
    copying src/cryptography/hazmat/backends/openssl/backend.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/backends/openssl
    copying src/cryptography/hazmat/backends/openssl/decode_asn1.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/backends/openssl
    copying src/cryptography/hazmat/backends/openssl/hashes.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/backends/openssl
    copying src/cryptography/hazmat/backends/openssl/cmac.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/backends/openssl
    copying src/cryptography/hazmat/backends/openssl/utils.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/backends/openssl
    copying src/cryptography/hazmat/backends/openssl/x509.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/backends/openssl
    copying src/cryptography/hazmat/backends/openssl/__init__.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/backends/openssl
    copying src/cryptography/hazmat/backends/openssl/ciphers.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/backends/openssl
    copying src/cryptography/hazmat/backends/openssl/ec.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/backends/openssl
    creating build/lib.linux-x86_64-2.7/cryptography/hazmat/backends/commoncrypto
    copying src/cryptography/hazmat/backends/commoncrypto/hmac.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/backends/commoncrypto
    copying src/cryptography/hazmat/backends/commoncrypto/backend.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/backends/commoncrypto
    copying src/cryptography/hazmat/backends/commoncrypto/hashes.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/backends/commoncrypto
    copying src/cryptography/hazmat/backends/commoncrypto/__init__.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/backends/commoncrypto
    copying src/cryptography/hazmat/backends/commoncrypto/ciphers.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/backends/commoncrypto
    creating build/lib.linux-x86_64-2.7/cryptography/hazmat/bindings/openssl
    copying src/cryptography/hazmat/bindings/openssl/_conditional.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/bindings/openssl
    copying src/cryptography/hazmat/bindings/openssl/binding.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/bindings/openssl
    copying src/cryptography/hazmat/bindings/openssl/__init__.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/bindings/openssl
    creating build/lib.linux-x86_64-2.7/cryptography/hazmat/bindings/commoncrypto
    copying src/cryptography/hazmat/bindings/commoncrypto/binding.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/bindings/commoncrypto
    copying src/cryptography/hazmat/bindings/commoncrypto/__init__.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/bindings/commoncrypto
    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.linux-x86_64-2.7/_padding.c'
    creating build/temp.linux-x86_64-2.7
    generating cffi module 'build/temp.linux-x86_64-2.7/_constant_time.c'
    generating cffi module 'build/temp.linux-x86_64-2.7/_openssl.c'
    building '_openssl' extension
    creating build/temp.linux-x86_64-2.7/build
    creating build/temp.linux-x86_64-2.7/build/temp.linux-x86_64-2.7
    gcc -pthread -fno-strict-aliasing -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic -D_GNU_SOURCE -fPIC -fwrapv -DNDEBUG -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic -D_GNU_SOURCE -fPIC -fwrapv -fPIC -I/usr/include/python2.7 -c build/temp.linux-x86_64-2.7/_openssl.c -o build/temp.linux-x86_64-2.7/build/temp.linux-x86_64-2.7/_openssl.o
    unable to execute gcc: No such file or directory
    error: command 'gcc' failed with exit status 1
    
    ----------------------------------------
Command "/usr/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-pQRuDh/cryptography/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-IWacHN-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-build-pQRuDh/cryptography/