I can't compile imap with the persistent connection option. Specifically, no reference of the CL_HALF flag in imap-4.7b nor php files. Fatal compilation in mail_close_full()

#ifdef OP_RELOGIN
/* AJS: stream close functions for persistent connections */
void mail_userlogout_it(pils *imap_le_struct)
{
        /* Close this user's session, putting the stream back
         * into AUTHENTICATE state.  (Note that IMAP does not
         * support this behavior... yet)
         */
        imap_le_struct->busy = 0;
        mail_close_full(imap_le_struct->imap_stream, imap_le_struct->flags | CL_HALF);
}