Description of problem:

LDAP service for DHCP doesn't work.  This error message is as far as you will get:

invalid dns update type

I will paste clips from the files includes/dhcpd.h and server/stables.c here,
and the problem should be pretty obvious:

includes/dhcpd.h, line 458:
---
# define SV_LDAP_SERVER                 46
# define SV_LDAP_PORT                   47
# define SV_LDAP_USERNAME               48
# define SV_LDAP_PASSWORD               49
# define SV_LDAP_BASE_DN                50
# define SV_LDAP_METHOD                 51
---

server/stables.c, line 487:
---
        { "ldap-server", "t",                           &server_universe, 47 },
        { "ldap-port", "d",                                    
&server_universe, 48 },
        { "ldap-username", "t",                         &server_universe, 49 },
        { "ldap-password", "t",                         &server_universe, 50 },
        { "ldap-base-dn", "t",                          &server_universe, 51 },
        { "ldap-method", "Nldap-methods.",      &server_universe, 52 },
---

Clearly the numbering of the parameters is not the same so things will not line
up.