Freebsd make install clean checksum error

在使用ports tree安裝軟件時候，如果遇到checksum不正確無法繼續安裝的時候，可以試試更換一下ports 下載源，重新下載安裝.

vi /etc/make.conf

MASTER_SITE_BACKUP?= \
http://ports.hshh.org/${DIST_SUBDIR}/\
ftp://ftp.freebsdchina/pub/FreeBSD/ports/distfiles/${DIST_SUBDIR}/\
ftp://ftp.freebsdchina/pub/FreeBSD/distfiles/${DIST_SUBDIR}/\
ftp://140.113.17.209/pub/ports/distfiles/${DIST_SUBDIR}/\
ftp://140.113.17.209/pub/distfiles/${DIST_SUBDIR}/
MASTER_SITE_OVERRIDE?= ${MASTER_SITE_BACKUP}

make clean

make install clean