以php5-pcre为例：
cd /usr/ports/devel/php5-pcre
make deinstall rmconfig clean
make build
make install
make clean
apachectl gracefull
完整删除软件
进入 cd /var/db/pkg
找到你要删除的软件
pkg_delete nginx-0.5.33
也可以使用如[pkg_delete p5-D* ]通配符，一次删除多个软件
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nginx报错nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use) 仔细参考nginx中文文档发现，发送信号USR2时，自动启动新的可执行文件，再手动启动的话就会报错 本质上也算是一种地址冲...
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The Vps is too old to get a newer OS from the provider. create /etc/apt/sources.list.d/jessie-backports.list, and fill in the following line...
