从使用入门文档：

IPHONE USE

IPHONE USE

MailCore有一个包含iPhone
的目标，但它需要一些
的额外编译二进制文件（OpenSSL
和CyrusSSL）。我目前无法提供这些
，但是
公司的Remail正在为iPhone提供
二进制文件和
MailCore的编译副本。联系
Remail获取更多信息：

MailCore has an included iPhone target, but it requires some additional compiled binaries (OpenSSL and CyrusSSL). I am unable to currently provide these, however the company Remail is offering the binaries and a compiled copy of MailCore for the iPhone. Contact Remail for more information:

mailcore@remail.com

mailcore@remail.com

在构建iPhone目标之前，您似乎需要获取这些内容。

It seems like you'd need to get those before building against the iPhone target.