问题
I'm getting this error when trying to install bcrypt with pip. I have libffi installed in a couple places (the Xcode OS X SDK, and from homebrew), but I don't know how to tell pip to look for it. Any suggestions?
Downloading/unpacking bcrypt==1.0.2 (from -r requirements.txt (line 41))
Running setup.py egg_info for package bcrypt
OS/X: confusion between 'cc' versus 'gcc' (see issue 123)
will not use '__thread' in the C code
c/_cffi_backend.c:14:10: fatal error: 'ffi.h' file not found
#include <ffi.h>
^
1 error generated.
Traceback (most recent call last):
File "<string>", line 16, in <module>
File "/Users/cody/virtualenvs/analytics/build/bcrypt/setup.py", line 104, in <module>
"Programming Language :: Python :: 3.3",
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/core.py", line 112, in setup
_setup_distribution = dist = klass(attrs)
File "build/bdist.macosx-10.9-intel/egg/setuptools/dist.py", line 239, in __init__
File "build/bdist.macosx-10.9-intel/egg/setuptools/dist.py", line 264, in fetch_build_eggs
File "build/bdist.macosx-10.9-intel/egg/pkg_resources.py", line 620, in resolve
dist = best[req.key] = env.best_match(req, ws, installer)
File "build/bdist.macosx-10.9-intel/egg/pkg_resources.py", line 858, in best_match
return self.obtain(req, installer) # try and download/install
File "build/bdist.macosx-10.9-intel/egg/pkg_resources.py", line 870, in obtain
return installer(requirement)
File "build/bdist.macosx-10.9-intel/egg/setuptools/dist.py", line 314, in fetch_build_egg
File "build/bdist.macosx-10.9-intel/egg/setuptools/command/easy_install.py", line 593, in easy_install
File "build/bdist.macosx-10.9-intel/egg/setuptools/command/easy_install.py", line 623, in install_item
File "build/bdist.macosx-10.9-intel/egg/setuptools/command/easy_install.py", line 811, in install_eggs
File "build/bdist.macosx-10.9-intel/egg/setuptools/command/easy_install.py", line 1017, in build_and_install
File "build/bdist.macosx-10.9-intel/egg/setuptools/command/easy_install.py", line 1005, in run_setup
distutils.errors.DistutilsError: Setup script exited with error: command 'cc' failed with exit status 1
Complete output from command python setup.py egg_info:
OS/X: confusion between 'cc' versus 'gcc' (see issue 123)
will not use '__thread' in the C code
c/_cffi_backend.c:14:10: fatal error: 'ffi.h' file not found
#include <ffi.h>
^
1 error generated.
Traceback (most recent call last):
File "<string>", line 16, in <module>
File "/Users/cody/virtualenvs/analytics/build/bcrypt/setup.py", line 104, in <module>
"Programming Language :: Python :: 3.3",
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/core.py", line 112, in setup
_setup_distribution = dist = klass(attrs)
File "build/bdist.macosx-10.9-intel/egg/setuptools/dist.py", line 239, in __init__
File "build/bdist.macosx-10.9-intel/egg/setuptools/dist.py", line 264, in fetch_build_eggs
File "build/bdist.macosx-10.9-intel/egg/pkg_resources.py", line 620, in resolve
dist = best[req.key] = env.best_match(req, ws, installer)
File "build/bdist.macosx-10.9-intel/egg/pkg_resources.py", line 858, in best_match
return self.obtain(req, installer) # try and download/install
File "build/bdist.macosx-10.9-intel/egg/pkg_resources.py", line 870, in obtain
return installer(requirement)
File "build/bdist.macosx-10.9-intel/egg/setuptools/dist.py", line 314, in fetch_build_egg
File "build/bdist.macosx-10.9-intel/egg/setuptools/command/easy_install.py", line 593, in easy_install
File "build/bdist.macosx-10.9-intel/egg/setuptools/command/easy_install.py", line 623, in install_item
File "build/bdist.macosx-10.9-intel/egg/setuptools/command/easy_install.py", line 811, in install_eggs
File "build/bdist.macosx-10.9-intel/egg/setuptools/command/easy_install.py", line 1017, in build_and_install
File "build/bdist.macosx-10.9-intel/egg/setuptools/command/easy_install.py", line 1005, in run_setup
distutils.errors.DistutilsError: Setup script exited with error: command 'cc' failed with exit status 1
----------------------------------------
Command python setup.py egg_info failed with error code 1 in /Users/cody/virtualenvs/analytics/build/bcrypt
回答1:
Without using sudo and CFLAGS and CPPFLAGS (unnecessary for pip):
$ brew install pkg-config libffi
$ export PKG_CONFIG_PATH=/usr/local/Cellar/libffi/3.0.13/lib/pkgconfig/
$ pip install bcrypt
回答2:
I finally got it working with the following with a little help from these posts:
brew install pkg-config libffi
sudo bash
export CFLAGS=-Qunused-arguments
export CPPFLAGS=-Qunused-arguments
export PKG_CONFIG_PATH=/usr/local/Cellar/libffi/3.0.13/lib/pkgconfig/
pip install bcrypt
回答3:
Xcode was already installed for me (as mentioned in the question itself that it does provide the ffi.h header), but for some reason that didn't populate /usr/include (as Zachary Young mentioned). I dug around to see why the /usr/include wasn't populated and found that the following command fixed it:
$ xcode-select --install
Missing /usr/include after Yosemite and Xcode install?
回答4:
Update 26/Aug/15
I think TA's answer is better in that it's handled by the system.
First off, I'm loathe to install Brew or Ports, but that's another issue.
I've been trying to pip install cryptography, which depends on cffi, which imports ffi.h.
I am curious why no one addressed that he (and me, and I believe others) have ffi installed with Xcode:
locate ffi.h
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/usr/include/ffi/ffi.h
since the error is specifically about "not finding" ffi.h with the following build command:
c/_cffi_backend.c:14:10: fatal error: 'ffi.h' file not found
#include <ffi.h>
...
...
/usr/bin/clang ...{omitted}... I/usr/include/ffi -I/usr/include/libffi
I have ffi.h, it's just that the system thinks it should be in /usr/include/....
My /usr/include directory happens to be empty, and not linked to anything, so I just linked the directory/file in question, to the place where it's not being found:
ln -fs {THAT_XCODE_SDK_FFI_PATH_FROM_ABOVE} /usr/include/ffi
I can now install and build cffi and cryptography.
I'm very novice when it comes to understanding build-chain/linking dynamics, and if this is bad, I don't get it... so, please let me know.
来源：https://stackoverflow.com/questions/22875270/error-installing-bcrypt-with-pip-on-os-x-cant-find-ffi-h-libffi-is-installed