Can't locate net/snmp. PM in @ INC .....

Ow do I install net: SNMP Perl module? There are 2 ways of doing this
1) by CPAN (BEST) 
On command line, as root:

[Your_host] #Perl-mcpan-e Shell 
CPAN shell -- CPAN registration and modules installation (v1.76)
Readline support enabled
CPAN>Install net: SNMP 

If it's the first time you run CPAN, it will probably ask you some (simple) questions.
CPAN will also ask you to satisfy some dependencies (crypt: Des, Digest: MD5, Etc ..).
2) "by hand" 

Get the folowings modules (tar.gz format) on www.cpan.org
-Crypt: des
-Digest: MD5
-Digest: sha1
-Digest: HMAC
-Net: SNMP

-Net: DNS

For each one (you must install net: SNMP at the end ):
Tar zxf <module> .tar.gz
CD <module>
Perl makefile. pl
Make Test
Make install