When using imapd with pam_krb5.so for authentication, imapd doesn't clean
up the ticket caches in /tmp.  This leaves behind a huge mess on a busy
system.  The following patch fixes:

--- imap-4.7/src/osdep/unix/ckp_pam.c.orig      Mon Dec 14 22:04:09 1998
+++ imap-4.7/src/osdep/unix/ckp_pam.c   Fri Apr 21 08:33:09 2000
@@ -96,9 +96,11 @@
       (pam_authenticate (hdl,NIL) != PAM_SUCCESS) ||
       (pam_acct_mgmt (hdl,NIL) != PAM_SUCCESS) ||
       (pam_setcred (hdl,PAM_ESTABLISH_CRED) != PAM_SUCCESS)) {
+    pam_setcred (hdl,PAM_DELETE_CRED);
     pam_end (hdl,PAM_AUTH_ERR);        /* failed */
     return NIL;
   }
+  pam_setcred (hdl,PAM_DELETE_CRED);
   pam_end (hdl,PAM_SUCCESS);   /* return success */
   return pw;
 }
--- imap-4.7/src/osdep/unix/ckp_pmb.c.orig      Thu Apr 29 23:29:55 1999
+++ imap-4.7/src/osdep/unix/ckp_pmb.c   Fri Apr 21 08:33:31 2000
@@ -92,9 +92,11 @@
       (pam_authenticate (hdl,NIL) != PAM_SUCCESS) ||
       (pam_acct_mgmt (hdl,NIL) != PAM_SUCCESS) ||
       (pam_setcred (hdl,PAM_ESTABLISH_CRED) != PAM_SUCCESS)) {
+    pam_setcred (hdl,PAM_DELETE_CRED);
     pam_end (hdl,PAM_AUTH_ERR);        /* failed */
     return NIL;
   }
+  pam_setcred (hdl,PAM_DELETE_CRED);
   pam_end (hdl,PAM_SUCCESS);   /* return success */
   return pw;
 }