配置make.conf文件
FreeBSD中的ports安装工具默认工具是用fetch，下载时经常出现龟速现象;为了提高ports安装速度，我推荐axel工具，当然具体还得配置下make.conf文件。
cd /usr/ports/ftp/axel
make install
#修改/et/make.conf
vi /etc/make.conf
#加入以下内容
FETCH_CMD=axel
FETCH_BEFORE_ARGS= -n 10 -a
FETCH_AFTER_ARGS=
DISABLE_SIZE=yes
MASTER_SITE_OVERRIDE?=\
http://ports.hshh.org/${DIST_SUBDIR}/\
http://ports.cn.freebsd.org/${DIST_SUBDIR}/\
ftp://ftp.freeBSDchina.org/pub/FreeBSD/ports/distfiles/${DIST_SUBDIR}/
MASTER_SITE_OVERRIDE?=${MASTER_SITE_BACKUP}
