公司有个项目用了 hyperf 框架，需要安装 swoole 扩展，我的新 m4 macbook air 尚未装过，执行 pecl install swoole，结果报错了。

In file included from /private/tmp/pear/temp/swoole/ext-src/php_swoole.cc:26:
/opt/homebrew/Cellar/php@8.3/8.3.19_1/include/php/ext/pcre/php_pcre.h:23:10: fatal error: 'pcre2.h' file not found
   23 | #include "pcre2.h"
      |          ^~~~~~~~~
1 error generated.
make: *** [ext-src/php_swoole.lo] Error 1
ERROR: `make' failed

提示缺少文件，手动安装了一下 pcre2，发现早就装过了，看来问题是找不到，而不是没有装。

$ brew install pcre2
Warning: pcre2 10.45 is already installed and up-to-date.
To reinstall 10.45, run:
  brew reinstall pcre2

问了下 ChatGPT，告诉我需要 export 两个东西：

export CPPFLAGS="-I/opt/homebrew/include -I/opt/homebrew/opt/pcre2/include"
export LDFLAGS="-L/opt/homebrew/lib -L/opt/homebrew/opt/pcre2/lib"

然后再执行 pecl install swoole，果然成功了。

ChatGPT 牛逼。