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我正在尝试运行一个建立在CherryPy上的网站，并正在使用Python 2.7.13在新环境中部署它，并一直在努力获取一切必要的设置。目前我坚持导入pyOpenSSL来启用SSL支持，但pyOpenSSL无法安装，因为没有安装必需的模块Cryptography。所以我一直在努力安装Cryptography，因为安装了所有其他必需的模块。Python加密模块导入错误
早些时候，我曾使用pip2.7 install cryptography > /tmp/piplog.txt后尝试安装模块和整个输出记录到一个单独的文件，我能够看到这样的
gcc -pthread -fno-strict-aliasing -g -O2 -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC -I/usr/local/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
build/temp.linux-x86_64-2.7/_openssl.c:434:30: error: openssl/opensslv.h: No such file or directory
build/temp.linux-x86_64-2.7/_openssl.c:448:27: error: openssl/e_os2.h: No such file or directory
build/temp.linux-x86_64-2.7/_openssl.c:468:25: error: openssl/aes.h: No such file or directory
build/temp.linux-x86_64-2.7/_openssl.c:471:26: error: openssl/asn1.h: No such file or directory
错误，这使我看到这些文件目前实际上被安装了find/-name opensslv.h，然后我从我安装的OpenSSL复制的文件与
cp -rf /usr/local/ssl/inclue/openssl/* /usr/local/include/python2.7/openssl
从而使加密模块会找到相应的文件，好像安装了一个更远，但我目前无法理解我在输出中看到的错误。完整的输出低于
Collecting cryptography
Using cached cryptography-1.9.tar.gz
Requirement already satisfied: idna>=2.1 in /usr/local/lib/python2.7/site-packages (from cryptography)
Requirement already satisfied: asn1crypto>=0.21.0 in /usr/local/lib/python2.7/site-packages (from cryptography)
Requirement already satisfied: six>=1.4.1 in /usr/local/lib/python2.7/site-packages/six-1.10.0-py2.7.egg (from cryptography)
Requirement already satisfied: enum34 in /usr/local/lib/python2.7/site-packages (from cryptography)
Requirement already satisfied: ipaddress in /usr/local/lib/python2.7/site-packages (from cryptography)
Requirement already satisfied: cffi>=1.7 in /usr/local/lib/python2.7/site-packages (from cryptography)
Requirement already satisfied: pycparser in /usr/local/lib/python2.7/site-packages (from cffi>=1.7->cryptography)
Installing collected packages: cryptography
Running setup.py install for cryptography: started
Running setup.py install for cryptography: finished with status 'error'
Complete output from command /usr/local/bin/python2.7 -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-VvLC6F/cryptography/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-iAcBaS-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/exceptions.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/utils.py -> 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
creating 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/extensions.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/base.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/name.py -> build/lib.linux-x86_64-2.7/cryptography/x509
copying src/cryptography/x509/certificate_transparency.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/backends
copying src/cryptography/hazmat/backends/interfaces.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
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
copying src/cryptography/hazmat/primitives/interfaces.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/padding.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives
copying src/cryptography/hazmat/primitives/mac.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/constant_time.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/hashes.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/hmac.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives
creating 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/ciphers.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/backends/openssl
copying src/cryptography/hazmat/backends/openssl/dh.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/dsa.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/__init__.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
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/backend.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/hashes.py -> 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
creating 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
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/_conditional.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/bindings/openssl
creating 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
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/utils.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/dh.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/dsa.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/utils.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/base.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
creating 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/kbkdf.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
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/concatkdf.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/scrypt.py -> build/lib.linux-x86_64-2.7/cryptography/hazmat/primitives/kdf
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 -g -O2 -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC -I/usr/local/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
build/temp.linux-x86_64-2.7/_openssl.c: In function ‘_setup_ssl_threads’:
build/temp.linux-x86_64-2.7/_openssl.c:3400: warning: comparison is always false due to limited range of data type
gcc -pthread -shared build/temp.linux-x86_64-2.7/build/temp.linux-x86_64-2.7/_openssl.o -lssl -lcrypto -o build/lib.linux-x86_64-2.7/cryptography/hazmat/bindings/_openssl.so
/usr/bin/ld: cannot find -lssl
collect2: ld returned 1 exit status
error: command 'gcc' failed with exit status 1
----------------------------------------