Why is there an error when compiling php?

Question

PHP

Good afternoon! I'm trying to install php-7.4.6 on Slackware 14.2
I get an error while compiling:

/tmp/php-7.4.6/ext/imap/php_imap.c:5084:22: ошибка: несовместимые типы для «mm_login»
PHP_IMAP_EXPORT void mm_login(NETMBX *mb, char *user, char **pwd, long trial)
                      ^
In file included from /usr/local/lib64/c-client/include/c-client.h:41:0,
                 from /tmp/php-7.4.6/ext/imap/php_imap.h:52,
                 from /tmp/php-7.4.6/ext/imap/php_imap.c:48:

Who faced similar? Help with a solution, I really need it