解决fatal error: 'ffi.h' file not found

python安装rumps时，出现错误：

Modules/objc/libffi_support.h:4:10: fatal error: 'ffi.h' file not found #include "ffi.h" ^ 1 error generated. error: Setup script exited with error: command 'cc' failed with exit status 1

原因是缺少libffi库，使用brew安装即可。

$ brew install pkg-config libffi $ export PKG_CONFIG_PATH=/usr/local/Cellar/libffi/3.0.13/lib/pkgconfig/ $ pip install bcrypt