我正在尝试为Django安装Python Social Auth，但未成功。
服务器操作系统：Ubuntu 14.04.5 LTS（GNU / Linux 2.6.32-042stab141.3 x86_64）
Python版本：3.4.3
Django版本（如果重要）：2.0.8
pip install social-auth-app-django...
Building wheels for collected packages: cffi
Building wheel for cffi (setup.py) ... error
ERROR: Complete output from command /home/ks/priroda-venv/bin/python3.4 -u -c 'import setuptools, tokenize;__file__='"'"'/tmp/pip-install-7c3p58ht/cffi/setup. py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replac e('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec '"'"'))' bdist_wheel -d /tmp/pip-wheel-an_3ux86 --python-tag cp34:
ERROR: running bdist_wheel
running build
running build_py
creating build
creating build/lib.linux-x86_64-3.4
creating build/lib.linux-x86_64-3.4/cffi
copying cffi/recompiler.py -> build/lib.linux-x86_64-3.4/cffi
copying cffi/setuptools_ext.py -> build/lib.linux-x86_64-3.4/cffi
copying cffi/commontypes.py -> build/lib.linux-x86_64-3.4/cffi
copying cffi/vengine_cpy.py -> build/lib.linux-x86_64-3.4/cffi
copying cffi/api.py -> build/lib.linux-x86_64-3.4/cffi
copying cffi/vengine_gen.py -> build/lib.linux-x86_64-3.4/cffi
copying cffi/model.py -> build/lib.linux-x86_64-3.4/cffi
copying cffi/error.py -> build/lib.linux-x86_64-3.4/cffi
copying cffi/ffiplatform.py -> build/lib.linux-x86_64-3.4/cffi
copying cffi/verifier.py -> build/lib.linux-x86_64-3.4/cffi
copying cffi/pkgconfig.py -> build/lib.linux-x86_64-3.4/cffi
copying cffi/cffi_opcode.py -> build/lib.linux-x86_64-3.4/cffi
copying cffi/lock.py -> build/lib.linux-x86_64-3.4/cffi
copying cffi/backend_ctypes.py -> build/lib.linux-x86_64-3.4/cffi
copying cffi/__init__.py -> build/lib.linux-x86_64-3.4/cffi
copying cffi/cparser.py -> build/lib.linux-x86_64-3.4/cffi
copying cffi/_cffi_include.h -> build/lib.linux-x86_64-3.4/cffi
copying cffi/parse_c_type.h -> build/lib.linux-x86_64-3.4/cffi
copying cffi/_embedding.h -> build/lib.linux-x86_64-3.4/cffi
copying cffi/_cffi_errors.h -> build/lib.linux-x86_64-3.4/cffi
running build_ext
building '_cffi_backend' extension
creating build/temp.linux-x86_64-3.4
creating build/temp.linux-x86_64-3.4/c
x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototype s -g -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-securit y -D_FORTIFY_SOURCE=2 -fPIC -DUSE__THREAD -DHAVE_SYNC_SYNCHRONIZE -I/usr/include /ffi -I/usr/include/libffi -I/usr/include/python3.4m -I/home/ks/priroda-venv/inc lude/python3.4m -c c/_cffi_backend.c -o build/temp.linux-x86_64-3.4/c/_cffi_back end.o
c/_cffi_backend.c:15:17: fatal error: ffi.h: No such file or directory
#include <ffi.h>
^
compilation terminated.
error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
----------------------------------------
ERROR: Failed building wheel for cffi
Running setup.py clean for cffi
Failed to build cffi
Installing collected packages: cffi, cryptography, social-auth-core, social-auth -app-django
Running setup.py install for cffi ... error
ERROR: Complete output from command /home/ks/priroda-venv/bin/python3.4 -u - c 'import setuptools, tokenize;__file__='"'"'/tmp/pip-install-7c3p58ht/cffi/setu p.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().repl ace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'ex ec'"'"'))' install --record /tmp/pip-record-x424l4as/install-record.txt --single -version-externally-managed --compile --install-headers /home/ks/priroda-venv/in clude/site/python3.4/cffi:
ERROR: running install
running build
running build_py
creating build
creating build/lib.linux-x86_64-3.4
creating build/lib.linux-x86_64-3.4/cffi
copying cffi/recompiler.py -> build/lib.linux-x86_64-3.4/cffi
copying cffi/setuptools_ext.py -> build/lib.linux-x86_64-3.4/cffi
copying cffi/commontypes.py -> build/lib.linux-x86_64-3.4/cffi
copying cffi/vengine_cpy.py -> build/lib.linux-x86_64-3.4/cffi
copying cffi/api.py -> build/lib.linux-x86_64-3.4/cffi
copying cffi/vengine_gen.py -> build/lib.linux-x86_64-3.4/cffi
copying cffi/model.py -> build/lib.linux-x86_64-3.4/cffi
copying cffi/error.py -> build/lib.linux-x86_64-3.4/cffi
copying cffi/ffiplatform.py -> build/lib.linux-x86_64-3.4/cffi
copying cffi/verifier.py -> build/lib.linux-x86_64-3.4/cffi
copying cffi/pkgconfig.py -> build/lib.linux-x86_64-3.4/cffi
copying cffi/cffi_opcode.py -> build/lib.linux-x86_64-3.4/cffi
copying cffi/lock.py -> build/lib.linux-x86_64-3.4/cffi
copying cffi/backend_ctypes.py -> build/lib.linux-x86_64-3.4/cffi
copying cffi/__init__.py -> build/lib.linux-x86_64-3.4/cffi
copying cffi/cparser.py -> build/lib.linux-x86_64-3.4/cffi
copying cffi/_cffi_include.h -> build/lib.linux-x86_64-3.4/cffi
copying cffi/parse_c_type.h -> build/lib.linux-x86_64-3.4/cffi
copying cffi/_embedding.h -> build/lib.linux-x86_64-3.4/cffi
copying cffi/_cffi_errors.h -> build/lib.linux-x86_64-3.4/cffi
running build_ext
building '_cffi_backend' extension
creating build/temp.linux-x86_64-3.4
creating build/temp.linux-x86_64-3.4/c
x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototy pes -g -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-secur ity -D_FORTIFY_SOURCE=2 -fPIC -DUSE__THREAD -DHAVE_SYNC_SYNCHRONIZE -I/usr/inclu de/ffi -I/usr/include/libffi -I/usr/include/python3.4m -I/home/ks/priroda-venv/i nclude/python3.4m -c c/_cffi_backend.c -o build/temp.linux-x86_64-3.4/c/_cffi_ba ckend.o
c/_cffi_backend.c:15:17: fatal error: ffi.h: No such file or directory
#include <ffi.h>
^
compilation terminated.
error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
----------------------------------------
ERROR: Command "/home/ks/priroda-venv/bin/python3.4 -u -c 'import setuptools, tokenize;__file__='"'"'/tmp/pip-install-7c3p58ht/cffi/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-record-x424l4as/install-record.txt --single-version-externally-managed --compile --install-headers /home/ks/priroda-venv/include/site/python3.4/cffi" failed with error code 1 in /tmp/pip-install-7c3p58ht/cffi/
对此该怎么办？