我正在使用自制的python安装并在virtualenvwrapper环境中使用pip收到错误：
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
Homebrew有一个libffi(brew install libffi)的公式,似乎很成功.
我可以跑
$python-config --include
产量：
-I/usr/local/Cellar/python/2.7.9/Frameworks/Python.framework/Versions/2.7/include/python2.7 -I/usr/local/Cellar/python/2.7.9/Frameworks/Python.framework/Versions/2.7/include/python2.7
那么我应该“添加包含`libffi.pc’的目录”吗？
echo $PKG_CONfig_PATH产生一个空字符串.
[SO上有人推荐过] [3]：
Use -I /opt/local/include on the command line
要么
C_INCLUDE_PATH=/opt/local/include in the environment.
我会加上这条线：
C_INCLUDE_PATH=/usr/local/Cellar/python/2.7.9/Frameworks/Python.framework/Versions/2.7/include/python2.7
到〜/ .bash_profile？
或者可能导出PKG_CONfig_PATH = /usr/local/Cellar / python / 2.7.9 / Frameworks / Python.framework / Versions / 2.7 / include / python2.7
解决方法:
弄清楚了.
brew install libffi
locate libffi.pc
(在这种情况下,我还必须运行命令来构建locate数据库,代码包含在来自locate的提示中)
返回/usr/local/Cellar/libffi/3.0.13/lib/pkgconfig/libffi.pc
然后在virtualenv中运行导出PKG_CONfig_PATH = /usr/local/Cellar / libffi / 3.0.13 / lib / pkgconfig /(libffi.pc的路径).
确认了echo $PKG_CONfig_PATH,显示了路径.
并点击“成功安装”模块！
如果它有用,这就是我使virtualenvwrapper环境工作的方式：
我已将以下内容添加到〜/ .bash_profile以及〜/ .bashrc文件中：
export VIRTUALENVWRAPPER_PYTHON=/usr/local/bin/python
export VIRTUALENVWRAPPER_VIRTUALENV=/usr/local/bin/virtualenv
export WORKON_HOME=$HOME/.virtualenvs
source /usr/local/bin/virtualenvwrapper.sh
export PATH=/usr/local/bin:$PATH