如何安装Sass
https://www.sass.hk

sass基于Ruby语言开发而成，因此安装sass前需要安装Ruby。（注:mac下自带Ruby无需在安装Ruby!）

//1.删除原gem源
gem sources –remove https://rubygems.org/

//2.添加国内淘宝源
gem sources -a https://ruby.taobao.org/

//3.打印是否替换成功
gem sources -l

//4.更换成功后打印如下
*** CURRENT SOURCES ***
https://ruby.taobao.org/

//安装如下(如mac安装遇到权限问题需加 sudo gem install sass)
gem install sass
gem install compass

如果报错 You must add /O=Digital Signature Trust Co./CN=DST Root CA X3 to your local
sudo gem install -n /usr/local/bin sass
sudo gem install -n /usr/local/bin compass

php7下安装event扩展

有效安排I/O，时间和信号的扩展 使用可用于特定平台的最佳I/O通知机制的事件,是PHP基础设施的libevent端口。
下载地址：http://pecl.php.net/package/event

安装支持库libevent，需要编译高版本（这里以最新版本release-2.1.8-stable为例）

wget -c https://github.com/libevent/libevent/releases/download/release-2.1.8-stable/libevent-2.1.8-stable.tar.gz -P /usr/local/src
cd /usr/local/src
tar -zxvf libevent-2.1.8-stable.tar.gz && cd libevent-2.1.8-stable
./configure –prefix=/usr/local/libevent-2.1.8
make && make install

安装event库（以event-2.3.0.tgz为例）

wget -c http://pecl.php.net/get/event-2.3.0.tgz -P /usr/local/src
cd /usr/local/src
tar -zxvf event-2.3.0.tgz && cd event-2.3.0
/usr/local/php/bin/phpize
./configure –with-php-config=/usr/local/php/bin/php-config –with-event-libevent-dir=/usr/local/libevent-2.1.8/
make && make install

在php.ini添加下面配置

extension=event.so

重启php-fpm后，使用php -m | grep event 查看event库插件是否安装成功