我收到错误：
bash-3.2# gmake install
.....
gmake[1]: Entering directory `/asterisk-1.4.2/sounds'
--2015-03-19 20:19:38-- http://ftp.digium.com/pub/telephony/sounds/releases/asterisk-moh-FREEPLAY-wav.tar.gz
Resolving ftp.digium.com... failed: node name or service name not known.
wget: unable to resolve host address `ftp.digium.com'
gmake[1]: *** /var/opt/asterisk/moh/.asterisk-moh-FREEPLAY-wav Error 1
gmake[1]: Leaving directory `/asterisk-1.4.2/sounds'
gmake: *** [datafiles] Error 2