net/samba4* build dependencies

[Horatiu MOLDOVAN]

Hi,
Trying to replace samba 3.6 i've observed some disturbing things on 
samba 4.x build:
- security/cyrus-sasl2, security/libgcrypt and security/gnutls are 
mandatory lib dependencies - is there a reason to add garbage to the system?
- OpenLDAP is built unconditionally regardless of the LDAP option 
setting - again, is there a reason to add more garbage to the system?
not sure why dns/py-dnspython is a build dependency...

(Test build options: ACL AIO FAM PTHREADPOOL QUOTAS UTMP)

Can someone clarify these?
Thank you,
---
H.