compile PHP with imap support

When compiling PHP --with-imap and --with-imap-ssl I received the following error:

configure: error: utf8_mime2text() has new signature, but U8T_CANONICAL is missing. This should not happen. Check config.log for additional information.

The fix is to install (on Debian) the following packages: libc-client2007e-dev and libc-client2007e

# apt-get -y install libc-client2007e-dev libc-client2007e

Also, you need to add at the configure step the "--with-kerberos" option.