执行composer install后报以下错误：
Problem 1
- laravel/horizon v1.4.3 requires ext-pcntl * -> the requested PHP extension pcntl is missing from your system. - lar
阅读背景：
报错laravel/horizon v1.4.3 requires ext-pcntl * -> the requested PHP extension pcntl is missing from your system.的解决办法
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