I am trying to install squid guard 1.4. I have downloaded it from squidguard.org. But it requires other things like

* Bison
* Flex
* Berkeley DB V.2.7.7, V3.2.x or 4.x (original site:
www.oracle.com/database/berkeley-db/index.html).
Annotation: Berkeley DB version 4.7 gives error messages during
compilation. Up to version 4.6 the compilation runs fine.
* A C compiler like GCC

From where should I get Bison, Flex and others. I have searched but failed to find. Please tell me about the location from where I may download.

Have you tried to use the package manager to install it ?

I don't have the RPMS. I don't find any one of these in my RHEL 4 CDs.

I am talking about yum.

yum install squidguard

You need to read the previous answer and unlearn some habits from other operating systems.

What you should have done is to use your package manager. If it is not on the CD it should get what you want from the 'net, provided you have appropriate repositories configured (and I would guess that you would have by default). This would also solve dependencies withour any extra effort on your part.

If you insist on using the manually downloaded version, you should be able to solve the dependencies manually. How? Please read the previous answers.

yum install is not working.

Ok. But this tells me nothing about why it is not working. If you get errors then why not post them here. Be specific and post as much information as possible.

The output of yum install squidguard is
-bash: yum: command not found