1. 禁用原来的FreeBSD.conf

# ee /etc/pkg/FreeBSD.conf

将

enabled: yes 

改为

enabled: no

保存(ESC, 然后 a -> a)即可

2. 创建另外一个 FreeBSD.conf

# mkdir -p /usr/local/etc/pkg/repos
# touch /usr/local/etc/pkg/repos/FreeBSD.conf

ustc:{
    url: "pkg+http://mirrors.ustc.edu.cn/freebsd-pkg/${ABI}/latest",
    mirror_type: "srv",
    signature_type: "none",
    fingerprints: "/usr/share/keys/pkg",
    enabled: yes
}