pip install failure for cryptography, gnureadline

[Pietro Paolini]

Hi everybody,

I am not really familiar with the Py subsystem, even though I have got some
guidance from some colleague, I am getting stuck when installing a list of
packages contained in a file, running such command :


pip install -r /home/pietro/projects/cloud-provisioning/requirements.txt

Brings me :


Collecting docutils>=0.10 (from botocore<1.4.0,>=1.3.0->boto3==1.2.3->-r
/home/pietro/projects/cloud-provisioning/requirements.txt (line 9))
Building wheels for collected packages: cryptography, gnureadline
  Running setup.py bdist_wheel for cryptography: started
  Running setup.py bdist_wheel for cryptography: finished with status
'error'
  Complete output from command
/home/pietro/python-environment/cloud-provisioning-ve-2/bin/python -u -c
"import setuptools,
tokenize;__file__='/tmp/pip-build-pzgHry/cryptography/setup.py';exec(compile(getattr(tokenize,
'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))"
bdist_wheel -d /tmp/tmpoDkrDHpip-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/cryptography
  copying src/cryptography/__init__.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/x509.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/exceptions.py ->
build/lib.linux-x86_64-2.7/cryptography
  copying src/cryptography/__about__.py ->
build/lib.linux-x86_64-2.7/cryptography
  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/interfaces.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/serialization.py ->
build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives
  ography/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/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
  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'
  creating build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives/src
  copying src/cryptography/hazmat/primitives/src/constant_time.c ->
build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives/src
  copying src/cryptography/hazmat/primitives/src/constant_time.h ->
build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives/src
  creating
build/lib.linux-x86_64-2.7/cryptography/hazmat/bindings/__pycache__
  copying
src/cryptography/hazmat/bindings/__pycache__/_Cryptography_cffi_590da19fxffc7b1ce.c
-> build/lib.linux-x86_64-2.7/cryptography/hazmat/bindings/__pycache__
  copying
src/cryptography/hazmat/bindings/__pycache__/_Cryptography_cffi_8f86901cxc1767c5a.c
-> build/lib.linux-x86_64-2.7/cryptography/hazmat/bindings/__pycache__
  copying
src/cryptography/hazmat/bindings/__pycache__/_Cryptography_cffi_d5a71fe5xf53f5318.c
-> build/lib.linux-x86_64-2.7/cryptography/hazmat/bindings/__pycache__
  running build_ext
  building '_Cryptography_cffi_d5a71fe5xf53f5318' extension
  creating build/temp.linux-x86_64-2.7
  creating build/temp.linux-x86_64-2.7/src
  creating build/temp.linux-x86_64-2.7/src/cryptography
  creating build/temp.linux-x86_64-2.7/src/cryptography/hazmat
  creating build/temp.linux-x86_64-2.7/src/cryptography/hazmat/bindings
  creating
build/temp.linux-x86_64-2.7/src/cryptography/hazmat/bindings/__pycache__
  x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall
-Wstrict-prototypes -fno-strict-aliasing -D_FORTIFY_SOURCE=2 -g
-fstack-protector-strong -Wformat -Werror=format-security -fPIC
-I/usr/include/python2.7 -c
src/cryptography/hazmat/bindings/__pycache__/_Cryptography_cffi_d5a71fe5xf53f5318.c
-o
build/temp.linux-x86_64-2.7/src/cryptography/hazmat/bindings/__pycache__/_Cryptography_cffi_d5a71fe5xf53f5318.o

src/cryptography/hazmat/bindings/__pycache__/_Cryptography_cffi_d5a71fe5xf53f5318.c:1944:15:
error: ‘SSLv3_method’ redeclared as different kind of symbol
   SSL_METHOD* (*SSLv3_method)(void) = NULL;
                 ^
  In file included from
src/cryptography/hazmat/bindings/__pycache__/_Cryptography_cffi_d5a71fe5xf53f5318.c:294:0:
  /usr/include/openssl/ssl.h:1892:19: note: previous declaration of
‘SSLv3_method’ was here
   const SSL_METHOD *SSLv3_method(void);  /* SSLv3 */
                     ^

src/cryptography/hazmat/bindings/__pycache__/_Cryptography_cffi_d5a71fe5xf53f5318.c:1945:15:
error: ‘SSLv3_client_method’ redeclared as different kind of symbol
   SSL_METHOD* (*SSLv3_client_method)(void) = NULL;
                 ^
  In file included from
src/cryptography/hazmat/bindings/__pycache__/_Cryptography_cffi_d5a71fe5xf53f5318.c:294:0:
  /usr/include/openssl/ssl.h:1894:19: note: previous declaration of
‘SSLv3_client_method’ was here
   const SSL_METHOD *SSLv3_client_method(void); /* SSLv3 */
                     ^

src/cryptography/hazmat/bindings/__pycache__/_Cryptography_cffi_d5a71fe5xf53f5318.c:1946:15:
error: ‘SSLv3_server_method’ redeclared as different kind of symbol
   SSL_METHOD* (*SSLv3_server_method)(void) = NULL;
                 ^
  In file included from
src/cryptography/hazmat/bindings/__pycache__/_Cryptography_cffi_d5a71fe5xf53f5318.c:294:0:
  /usr/include/openssl/ssl.h:1893:19: note: previous declaration of
‘SSLv3_server_method’ was here
   const SSL_METHOD *SSLv3_server_method(void); /* SSLv3 */
                     ^
  error: command 'x86_64-linux-gnu-gcc' failed with exit status 1



It looks pretty confusing to me since I can't fix it just installing some
packages, have you any idea about why is this happening ? I am running on a
Debian linux distro. I do not have any problem to manually install  "pip
install cryptography" which works fine.

What does "Building wheels for collected packages: cryptography,
gnureadline" mean ?

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