Description:
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I use manualy compiled imap-2007d. I do this because there is a 
problem - c-client has small number FD_SETSIZE. If your apache 
httpd.conf opens a lot of log files than c-client crashes apache 
child if called from PHP. So I cant use standard c-client suplied 
with linux.

Now when I try to compile PHP 5.2.8 with manualy complied c-client

/root/naox/php-5.2.8.mod/ext/imap/php_imap.c: In function 
'zm_startup_imap':
/root/naox/php-5.2.8.mod/ext/imap/php_imap.c:477: error: 'auth_gss' 
undeclared (first use in this function)
/root/naox/php-5.2.8.mod/ext/imap/php_imap.c:477: error: (Each 
undeclared identifier is reported only once
/root/naox/php-5.2.8.mod/ext/imap/php_imap.c:477: error: for each 
function it appears in.)
/root/naox/php-5.2.8.mod/ext/imap/php_imap.c: In function 
'zif_imap_rfc822_parse_adrlist':
/root/naox/php-5.2.8.mod/ext/imap/php_imap.c:2175: warning: passing 
argument 3 of 'rfc822_parse_adrlist' from incompatible pointer type
make: *** [ext/imap/php_imap.lo] Error 1


Problem only occurs in PHP 5.2.8. In PHP 5.2.6 everything works fine. 
Also problem does not appear if I compile PHP 5.2.8 with standard c-
client suplied with linux.

If I copy ext/imap/php_imap.c from 5.2.6 into 5.2.8 I can compile php 
without problems

There are some old bug reports about this problem resolved years ago 
with "fixed in cvs". So I suspect you reverted your php_imap.c in 
5.2.8 to state where it was not fixec.