How to intall Mrtg on Slackware 13.1

in this section we learn how to install MRTG program that help us to see network devices how use bandwidth,CPU usage ....
we need to configure and run 3 service that work directly by Mrtg : apache web server -running SNMP at least a password between MRTG <==(Community)==> SNMP that call it community!
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Step I

for running apache web server :
1)chmod +x /etc/rc.d/rc.httpd
2) /etc/rc.d/rc.httpd start
3) ps -A | grep httpd <== check truely running
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Step II
in this step running SNMP ( Simple Network Monitoring Protocol )
on command line Write :
1)snmpconf push Enter
1.a-chose 1 (snmpd.conf)
1.b-chose 1 (Access control Setup)
1.c-chose 3 (snmp V1/V2 Read only community )
{tell which IP can access snmp : 127.0.0.1}
1.d- chose OIO and enter
for exit this part : finished,finished and Quit
now Move snmp.conf /etc/snmp
mv snmp.conf /etc/snmp
chmod +x /etc/rc.d/rc.snmpd
/etc/rc.d/rc.snmpd start
ps -A | grep snmp
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Step III
Install MRTG with Source and compile it ;)
1-download it