apt-get wants to delete postfix

I have a custom compiled postfix. I'm running apt-get the first time on my server and it insists it has to delete postfix. I don't want to touch that program. I've looked through all the man pages. How do I get it to update my system and NOT delete postfix? -- Jim Sabatke Hire Me!! - See my resume at http://my.execpc.com/~jsabatke Do not meddle in the affairs of Dragons, for you are crunchy and good with ketchup. NOTE: Please do not email me any attachments with Microsoft extensions. They are deleted on my ISP's server before I ever see them, and no bounce message is sent.