gistfile1.txt

Step 12 : RUN pip install cryptography
 ---> Running in b0315c2f2569
/usr/lib/python2.7/site-packages/pip/_vendor/requests/packages/urllib3/util/ssl_.py:90: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. For more information, see https://urllib3.readthedocs.org/en/latest/security.html#insecureplatformwarning.
  InsecurePlatformWarning
Collecting cryptography
/usr/lib/python2.7/site-packages/pip/_vendor/requests/packages/urllib3/util/ssl_.py:90: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. For more information, see https://urllib3.readthedocs.org/en/latest/security.html#insecureplatformwarning.
  InsecurePlatformWarning
  Downloading cryptography-0.9.3.tar.gz (303kB)
Collecting idna (from cryptography)
  Downloading idna-2.0-py2.py3-none-any.whl (61kB)
Collecting pyasn1 (from cryptography)
  Downloading pyasn1-0.1.8.tar.gz (75kB)
Collecting six>=1.4.1 (from cryptography)
  Downloading six-1.9.0-py2.py3-none-any.whl
Collecting setuptools (from cryptography)
  Downloading setuptools-18.0.1-py2.py3-none-any.whl (461kB)
Collecting enum34 (from cryptography)
  Downloading enum34-1.0.4.tar.gz
Collecting ipaddress (from cryptography)
  Downloading ipaddress-1.0.14-py27-none-any.whl
Collecting cffi>=0.8 (from cryptography)
  Downloading cffi-1.1.2.tar.gz (326kB)
    Complete output from command python setup.py egg_info:
    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/ .)
    
    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-zPQmsK/cffi
INFO[0004] The command &{[/bin/sh -c pip install cryptography --upgrade]} returned a non-zero code: 1