每次执行PHP脚本时，我的apache错误日志都会出现这些错误消息：
[Thu Mar 21 20:17:54 2013] [error] [client 127.0.0.1] No log handling enabled - turning on stderr logging, referer: http://localhost/login.html
[Thu Mar 21 20:17:54 2013] [error] [client 127.0.0.1] Cannot find module (IP-MIB): At line 0 in (none), referer: http://localhost/login.html
[Thu Mar 21 20:17:54 2013] [error] [client 127.0.0.1] Cannot find module (IF-MIB): At line 0 in (none), referer: http://localhost/login.html
[Thu Mar 21 20:17:54 2013] [error] [client 127.0.0.1] Cannot find module (TCP-MIB): At line 0 in (none), referer: http://localhost/login.html
[Thu Mar 21 20:17:54 2013] [error] [client 127.0.0.1] Cannot find module (UDP-MIB): At line 0 in (none), referer: http://localhost/login.html
[Thu Mar 21 20:17:54 2013] [error] [client 127.0.0.1] Cannot find module (HOST-RESOURCES-MIB): At line 0 in (none), referer: http://localhost/login.html
[Thu Mar 21 20:17:54 2013] [error] [client 127.0.0.1] Cannot find module (SNMPv2-MIB): At line 0 in (none), referer: http://localhost/login.html
[Thu Mar 21 20:17:54 2013] [error] [client 127.0.0.1] Cannot find module (SNMPv2-SMI): At line 0 in (none), referer: http://localhost/login.html
[Thu Mar 21 20:17:54 2013] [error] [client 127.0.0.1] Cannot find module (NOTIFICATION-LOG-MIB): At line 0 in (none), referer: http://localhost/login.html
[Thu Mar 21 20:17:54 2013] [error] [client 127.0.0.1] Cannot find module (UCD-SNMP-MIB): At line 0 in (none), referer: http://localhost/login.html
[Thu Mar 21 20:17:54 2013] [error] [client 127.0.0.1] Cannot find module (UCD-DEMO-MIB): At line 0 in (none), referer: http://localhost/login.html
[Thu Mar 21 20:17:54 2013] [error] [client 127.0.0.1] Cannot find module (SNMP-TARGET-MIB): At line 0 in (none), referer: http://localhost/login.html
[Thu Mar 21 20:17:54 2013] [error] [client 127.0.0.1] Cannot find module (NET-SNMP-AGENT-MIB): At line 0 in (none), referer: http://localhost/login.html
[Thu Mar 21 20:17:54 2013] [error] [client 127.0.0.1] Cannot find module (DISMAN-EVENT-MIB): At line 0 in (none), referer: http://localhost/login.html
[Thu Mar 21 20:17:54 2013] [error] [client 127.0.0.1] Cannot find module (SNMP-VIEW-BASED-ACM-MIB): At line 0 in (none), referer: http://localhost/login.html
[Thu Mar 21 20:17:54 2013] [error] [client 127.0.0.1] Cannot find module (SNMP-COMMUNITY-MIB): At line 0 in (none), referer: http://localhost/login.html
[Thu Mar 21 20:17:54 2013] [error] [client 127.0.0.1] Cannot find module (UCD-DLMOD-MIB): At line 0 in (none), referer: http://localhost/login.html
[Thu Mar 21 20:17:54 2013] [error] [client 127.0.0.1] Cannot find module (SNMP-FRAMEWORK-MIB): At line 0 in (none), referer: http://localhost/login.html
[Thu Mar 21 20:17:54 2013] [error] [client 127.0.0.1] Cannot find module (SNMP-MPD-MIB): At line 0 in (none), referer: http://localhost/login.html
[Thu Mar 21 20:17:54 2013] [error] [client 127.0.0.1] Cannot find module (SNMP-USER-BASED-SM-MIB): At line 0 in (none), referer: http://localhost/login.html
[Thu Mar 21 20:17:54 2013] [error] [client 127.0.0.1] Cannot find module (SNMP-NOTIFICATION-MIB): At line 0 in (none), referer: http://localhost/login.html
[Thu Mar 21 20:17:54 2013] [error] [client 127.0.0.1] Cannot find module (SNMPv2-TM): At line 0 in (none), referer: http://localhost/login.html
现在我已经阅读了很多帖子，提到我需要从ext（或extras）文件夹中复制MIB文件，然后创建一个环境变量MIBDIR来指向该文件夹。我的问题是这些* .MIB文件在我的机器上的任何地方都不存在......我究竟如何摆脱这些错误？