有关mrtg的问题?

grubby23

系统:centos
apache snmp gd均已经安装了
mrtg安装在/usr/local/mrtg下
工作目录为/var/www/html/mrtg
在shell命令行下执行
env LANG=C /usr/local/mrtg/bin/mrtg /var/www/html/mrtg/mrtg.cfg
成功!

但是当我编辑crontab -u root -e 加入
*/5 * * * * env LANG=C /usr/local/mrtg/bin/mrtg /var/www/html/mrtg/mrtg.cfg
是系统就会给root邮箱发错误信息
Message 4:
From root@localhost.localdomain  Wed Dec  6 10:35:02 2006
Date: Wed, 6 Dec 2006 10:35:02 +0800
From: root@localhost.localdomain (Cron Daemon)
To: root@localhost.localdomain
Subject: Cron <root@localhost> env LANG=C /usr/local/mrtg/bin/mrtg /var/www/html/mrtg/mrtg.cfg
X-Cron-Env: <SHELL=/bin/sh>
X-Cron-Env: <HOME=/root>
X-Cron-Env: <ATH=/usr/bin:/bin>
X-Cron-Env: <LOGNAME=root>
X-Cron-Env: <USER=root>

/usr/local/mrtg/bin/rateup: error while loading shared libraries: libgd.so.2: ca
nnot open shared object file: No such file or directory
Wednesday, 6 December 2006 at 10:35: ERROR: Skipping webupdates because rateup d
id not return anything sensible
Wednesday, 6 December 2006 at 10:35: WARNING: rateup died from Signal 0
with Exit Value 127 when doing router '192.168.3.123_2'
Signal was 0, Returncode was 127