LIBPCAP

Go to: http://www.tcpdump.org/ and select a download link for Libpcap (at time of writing this it is libpcap-0.9.4.tar.gz)
cd back to the snorttemp map:

cd /root/snorttemp

and download the libpcap-0.9.4.tar.gz file:

wget http://www.tcpdump.org/release/libpcap-0.9.4.tar.gz

Untar the file:

tar -xvzf libpcap-0.9.4.tar.gz

Remove the file:

rm libpcap-0.9.4.tar.gz

BASE (Basic Analysis and Security Engine )

Go to: http://secureideas.sourceforge.net/ and download the latest release (at time of writing BASE 1.2.5 (sarah))
cd back to the snorttemp map:

cd /root/snorttemp

and download the base-1.2.5.tar.gz file:

wget http://surfnet.dl.sourceforge.net/sourceforge/secureideas/base-1.2.5.tar.gz

Untar the file:

tar -xvzf base-1.2.5.tar.gz

Remove the file:

rm base-1.2.5.tar.gz

ADOdb: (ADOdb Database Abstraction Library for PHP (and Python).)

Go to: http://adodb.sourceforge.net/ and download the latest release (at time of writing adodb-490-for-php)
cd back to the snorttemp map:

cd /root/snorttemp

and download the adodb490.tgz file:

wget http://surfnet.dl.sourceforge.net/sourceforge/adodb/adodb490.tgz

Untar the file:

tar -xvzf adodb490.tgz

Remove the file:

rm adodb490.tgz

ls should now show the following directorys in /root/snorttemp:
adodb, base-1.2.5, libpcap-0.9.4, pcre-6.3 and snort-2.6.0