Thanks. OK, so I did it. But another problem uccured :
mainuser@station1:~/softwares/sage-6.8$ ./sage -pip install pyopenssl
You are using pip version 6.1.1, however version 7.1.2 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
Collecting pyopenssl
Downloading pyOpenSSL-0.15.1-py2.py3-none-any.whl (102kB)
100% |████████████████████████████████| 106kB 817kB/s
Requirement already satisfied (use --upgrade to upgrade): six>=1.5.2 in
./local/lib/python2.7/site-packages/six-1.9.0-py2.7.egg (from pyopenssl)
Collecting cryptography>=0.7 (from pyopenssl)
Downloading cryptography-1.0.2.tar.gz (332kB)
100% |████████████████████████████████| 335kB 367kB/s
Collecting idna>=2.0 (from cryptography>=0.7->pyopenssl)
Downloading idna-2.0-py2.py3-none-any.whl (61kB)
100% |████████████████████████████████| 61kB 870kB/s
Collecting pyasn1>=0.1.8 (from cryptography>=0.7->pyopenssl)
Downloading pyasn1-0.1.9-py2.py3-none-any.whl
Requirement already satisfied (use --upgrade to upgrade): setuptools in
./local/lib/python2.7/site-packages/setuptools-12.4-py2.7.egg (from
cryptography>=0.7->pyopenssl)
Collecting enum34 (from cryptography>=0.7->pyopenssl)
Downloading enum34-1.0.4.tar.gz
Collecting ipaddress (from cryptography>=0.7->pyopenssl)
Downloading ipaddress-1.0.14-py27-none-any.whl
Collecting cffi>=1.1.0 (from cryptography>=0.7->pyopenssl)
Downloading cffi-1.2.1.tar.gz (335kB)
100% |████████████████████████████████| 335kB 305kB/s
Collecting pycparser (from cffi>=1.1.0->cryptography>=0.7->pyopenssl)
Downloading pycparser-2.14.tar.gz (223kB)
100% |████████████████████████████████| 225kB 473kB/s
Installing collected packages: idna, pyasn1, enum34, ipaddress, pycparser,
cffi, cryptography, pyopenssl
Running setup.py install for enum34
Running setup.py install for pycparser
Running setup.py install for cffi
Complete output from command
/home/mainuser/softwares/sage-6.8/local/bin/python -c "import setuptools,
tokenize;__file__='/tmp/pip-build-Xm2z64/cffi/setup.py';exec(compile(getattr(tokenize,
'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))"
install --record /tmp/pip-ldD7Zt-record/install-record.txt
--single-version-externally-managed --compile:
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
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/cffi
copying cffi/api.py -> build/lib.linux-x86_64-2.7/cffi
copying cffi/backend_ctypes.py -> build/lib.linux-x86_64-2.7/cffi
copying cffi/vengine_cpy.py -> build/lib.linux-x86_64-2.7/cffi
copying cffi/gc_weakref.py -> build/lib.linux-x86_64-2.7/cffi
copying cffi/ffiplatform.py -> build/lib.linux-x86_64-2.7/cffi
copying cffi/__init__.py -> build/lib.linux-x86_64-2.7/cffi
copying cffi/commontypes.py -> build/lib.linux-x86_64-2.7/cffi
copying cffi/model.py -> build/lib.linux-x86_64-2.7/cffi
copying cffi/setuptools_ext.py -> build/lib.linux-x86_64-2.7/cffi
copying cffi/cffi_opcode.py -> build/lib.linux-x86_64-2.7/cffi
copying cffi/verifier.py -> build/lib.linux-x86_64-2.7/cffi
copying cffi/lock.py -> build/lib.linux-x86_64-2.7/cffi
copying cffi/cparser.py -> build/lib.linux-x86_64-2.7/cffi
copying cffi/vengine_gen.py -> build/lib.linux-x86_64-2.7/cffi
copying cffi/recompiler.py -> build/lib.linux-x86_64-2.7/cffi
copying cffi/_cffi_include.h -> build/lib.linux-x86_64-2.7/cffi
copying cffi/parse_c_type.h -> build/lib.linux-x86_64-2.7/cffi
running build_ext
building '_cffi_backend' extension
creating build/temp.linux-x86_64-2.7
creating build/temp.linux-x86_64-2.7/c
gcc -fno-strict-aliasing -g -O2 -DNDEBUG -g -fwrapv -O3 -Wall -fPIC
-DUSE__THREAD -I/usr/include/ffi -I/usr/include/libffi
-I/home/mainuser/softwares/sage-6.8/local/include/python2.7 -c
c/_cffi_backend.c -o build/temp.linux-x86_64-2.7/c/_cffi_backend.o
c/_cffi_backend.c:13:17: fatal error: ffi.h: Aucun fichier ou dossier
de ce type
#include <ffi.h>
^
compilation terminated.
error: command 'gcc' failed with exit status 1
----------------------------------------
Command "/home/mainuser/softwares/sage-6.8/local/bin/python -c "import
setuptools,
tokenize;__file__='/tmp/pip-build-Xm2z64/cffi/setup.py';exec(compile(getattr(tokenize,
'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))"
install --record /tmp/pip-ldD7Zt-record/install-record.txt
--single-version-externally-managed --compile" failed with error code 1 in
/tmp/pip-build-Xm2z64/cffi
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