ImportError: pycurl: libcurl link-time ssl backend

解决pycurl安装错误 由于libcurl的源码编译因素，在安装pycurl可能会导致以下两种错误。

错误1：

ImportError: pycurl: libcurl link-time ssl backend (openssl) 
is different from compile-time ssl backend (none/other)

错误1的解决办法如下：

$ pip uninstall pycurl
$ export PYCURL_SSL_LIBRARY=openssl
$ pip install pycurl

错误2：

ImportError: pycurl: libcurl link-time ssl backend (nss) 
is different from compile-time ssl backend (openssl)

错误2的解决办法如下：

$ pip uninstall pycurl
$ export PYCURL_SSL_LIBRARY=nss
$ pip install pycurl

参考 解决pycurl安装错误