Nessus 3.0 on Gentoo
This is a quick and dirty guide to get Nessus 3.0 to install on Gentoo.
First, download Nessus-3.0.3-fc5.i386.rpm from nessus.org
Use rpm2targz Nessus-3.0.3-fc5.i386.rpm to convert the package from RPM format to a gzip'ed tar file.
Move the resulting file to your / directory.
Use tar -zxvf Nessus-3.0.3-fc5.i386.tar.gz to decompress and un'tar the file.
Edit /etc/ld.so.conf and append /opt/nessus/lib to the end of the file.
Run ldconfig to make those changes take effect.
Next, cd into your /usr/lib directory and do the following:
ln -s libssl.so.0.9.7 libssl.so.6
ln -s libcrypto.so.0.9.7 libcrypto.so.6
You can now finish installing nessus as normal (e.g /opt/nessus/sbin/nessus-mkcert). You can also test your installation by running the command: /opt/nessus/sbin/nessusd -d
[UPDATE] You will need to edit /opt/nessus/sbin/nessus-update-plugins . Look for the line reading "gzip=/usr/bin/gzip" and change it to read "gzip=/bin/gzip"
[UPDATE 2] Instead of making the change to /etc/ld.so.conf above, you should create a file in the /etc/env.d/ directory called 08nessus. Then file should only contain the line: LDPATH=/opt/nessus/lib. This change is necessary because the env-update script will overwrite the changes you make directly to /etc/ls.so.conf.