在使用苹果的brew install homebrew/php/php55的时候提示 Cannot find OpenSSL's <evp.h>，官方建议查看https://github.com/homebrew/homebrew-php/issues，看一下，第二条就是。
在内容里有人回复，加个参数 吧。。brew install phpxx --with-brewed-openssl，但不幸的是，仍然报上述错误，这时候有人回复了一下，你先装个commandtools吧
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- @Anei Wasn't sure which one, but I think this one did the trick:
- Yep, installing the Command Line tools directly from Apple did the trick:
- "Command Line Tools (OS X 10.10) for Xcode - Xcode 6.1.1" (169.94 MB)
- I didn't think that was a solution as I had went into the App Store update and I was "up to date" with the command line tools. Thanks / feel free to close.
点击下载、安装。再brew install，一切顺利解决！