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  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  build/temp.linux-x86_64-2.7/_openssl.c:434:30: fatal error: openssl/opensslv.h: No such file or directory  #include <openssl/opensslv.h>      ^  compilation terminated.  error: command 'gcc' failed with exit status 1   ---------------------------------------- Command "/usr/bin/python2 -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-hRMlG0/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-ReCoWo-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-build-hRMlG0/cryptography/ [root@AY131203102210033c39Z ~]# yum install openssl build/temp.linux-x86_64-2.7/_openssl.c:434:30: fatal error: openssl/opensslv.h: No such file or directory ^C  Exiting on user cancel. 

Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile  * base: mirrors.aliyun.com  * epel: mirrors.aliyun.com  * extras: mirrors.aliyun.com  * updates: mirrors.aliyun.com Installed Packages Name : openssl Arch : x86_64 Epoch : 1 Version : 1.0.1e Release : 60.el7_3.1 Size : 1.5 M Repo : installed Summary : Utilities from the general purpose cryptography library with TLS implementation URL  : http://www.openssl.org/ License : OpenSSL Description : The OpenSSL toolkit provides support for secure communications between   : machines. OpenSSL includes a certificate management tool and shared   : libraries which provide various cryptographic algorithms and   : protocols.