PIP install 无法找到 ffi.h，即使它识别 libffi

我已经在我的 Linux 服务器上安装了 libffi，并且正确地将 PKG_CONFIG_PATH环境变量设置到了正确的目录，因为 pip认识到它已经安装了，但是，当尝试安装 pyOpenSSL 时，pip 声明它无法找到“ ffi.h”文件。我知道 ffi.h既存在也存在它的目录，那么我该如何弥补 ffi.h和 pip之间的这个差距呢？

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You need to install the development package as well.

libffi-dev on Debian/Ubuntu, libffi-devel on Redhat/Centos/Fedora.

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最佳答案

You can use CFLAGS (and LDFLAGS or various other compiler and linker options) in front of the pip command (ditto for setup.py):

Something similar to the following should work:

CFLAGS=-I/usr/include/libffi/include pip install pyOpenSSL
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You need to install the development package for libffi.

On RPM based systems (Fedora, Redhat, CentOS etc) the package is named libffi-devel.

Not sure about Debian/Ubuntu systems, I'm sure someone else will pipe up with that.

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pip packages usually don't use pkg-config. Therefore, you should set CFLAGS and LDFLAGS manually:

CFLAGS=$(pkg-config --cflags libffi) LDFLAGS=$(pkg-config --libs libffi) pip install pyOpenSSL
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To add to mhawke's answer, usually the Debian/Ubuntu based systems are "-dev" rather than "-devel" for RPM based systems

So, for Ubuntu it will be apt-get install libffi libffi-dev

RHEL, CentOS, Fedora (up to v22) yum install libffi libffi-devel

Fedora 23+ dnf install libffi libffi-devel

OSX/MacOS (assuming homebrew is installed) brew install libffi

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On Debian, 

apt-get install libffi-dev
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on CentOS:

yum install libffi-devel
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Ubuntu/Mint 

sudo apt-get install libffi6 libffi-dev

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