pip安装openssl/aes.h错误和libxml/xmlversion.h错误（osx）

Question

我有'requirements.txt'文件，我点安装它。并不断地得到这些错误：

Cryptography_cffi_a269d620xd5c405b7.c:217:10: fatal error: 'openssl/aes.h' file not found 
#include <openssl/aes.h> 
     ^
1 error generated. 
error: command 'clang' failed with exit status 1 

而这个错误：

fatal error: 'libxml/xmlversion.h' file not found 
#include "libxml/xmlversion.h" 
     ^
1 error generated. 
error: command 'clang' failed with exit status 1 

试图https://github.com/pyca/cryptography/issues/2350

Answer 1

我做了两件事情来解决这个问题了。

brew link --force openssl 

和

xcode-select --install 

Answer 2

现在，不幸的是，我们不能brew link --force openssl。所以你也可以设置如下的环境变量：

export LD_LIBRARY_PATH=/usr/local/opt/openssl/lib:$LD_LIBRARY_PATH 
export CPATH=/usr/local/opt/openssl/include:$LD_LIBRARY_PATH 

And do pip install。