I needed IMAP support in PHP4, so I attempted to compile it in using the instructions here. I kept getting the error:

checking whether IMAP works... no
configure: error: build test failed. Please check the config.log for details.

In my configure.log, I was seeing this:

configure:43918: undefined reference to `auth_gssapi_valid'
collect2: ld returned 1 exit status

The problem was that I was trying to use imap2004e. When I found and download imap2001c as an rpm, and installed it, everything went fine. Just logging this for future frustrated sysadmins without a solution.

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