我正在尝试设置 Laravel 的 Valet，它作为依赖项需要 PHP 7。当我尝试使用 Homebrew 安装 PHP 7 时，出现以下错误：
Configuring SAPI modules
checking for Apache 2.0 handler-module support via DSO through APXS...
Sorry, I cannot run apxs. Possible reasons follow:
1. Perl is not installed
2. apxs was not found. Try to pass the path using --with-apxs2=/path/to/apxs
3. Apache was not built using --enable-so (the apxs usage page is displayed)
The output of /usr/sbin/apxs follows:
apxs:Error: /Applications/Xcode.app/Contents/Developer/Toolchains/OSX10.12.xctoolchain/usr/local/bin/apr-1-config not found!.
configure: error: Aborting
READ THIS: https://git.io/brew-troubleshooting
If reporting this issue please do so at (not Homebrew/brew):
https://github.com/Homebrew/homebrew-php/issues
These open issues may also help:
php70-dbase https://github.com/Homebrew/homebrew-php/issues/3508
php70-intl not found https://github.com/Homebrew/homebrew-php/issues/3591
php70-opcache install issue https://github.com/Homebrew/homebrew-php/issues/3586
Problem installing php70-mcrypt, php70-opcache, php70-xdebug on El Capitan https://github.com/Homebrew/homebrew-php/issues/3587
Add php70-zmq formula https://github.com/Homebrew/homebrew-php/pull/3474
Problem installing homebrew/php/php70-imagick https://github.com/Homebrew/homebrew-php/issues/3571
Install PHP70: Incompatible library version https://github.com/Homebrew/homebrew-php/issues/3444
brew install php70-redis https://github.com/Homebrew/homebrew-php/issues/2762
Allow --enable-redis-igbinary for php70-redis https://github.com/Homebrew/homebrew-php/pull/3473
Add head formula for php70-uploadprogress https://github.com/Homebrew/homebrew-php/pull/3178
这是全新安装的 MacOS Sierra（实际版本，not测试版）并全新安装 Homebrew（已更新）。我已安装、运行并同意 Xcode 许可协议。
我不知道这些错误意味着什么。我该如何修复它们？
没错我已经弄清楚了。我在下面发布了成功安装所需组件的步骤，以防其他人偶然发现此问题：
1）。确保 Homebrew 是最新的：
brew update
2）。确保已安装 Xcode，然后在终端中输入以下内容，以修复 PHP 7 错误：
brew install apr apr-util
sudo mkdir -p /Applications/Xcode.app/Contents/Developer/Toolchains/OSX10.12.xctoolchain/usr/local/bin/
sudo ln -s /usr/local/opt/apr/bin/apr-1-config /Applications/Xcode.app/Contents/Developer/Toolchains/OSX10.12.xctoolchain/usr/local/bin/
sudo ln -s /usr/local/opt/apr-util/bin/apu-1-config /Applications/Xcode.app/Contents/Developer/Toolchains/OSX10.12.xctoolchain/usr/local/bin/
3）。运行以下命令（否则 PHP 安装会抱怨缺少 libz）：
xcode-select --install
4).您现在可以使用 Homebrew 安装 PHP 7：
brew install homebrew/php/php70
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