variants vs separate ports

[Bradley Giesbrecht]

Hello,


I am working on a port where I must chose only one of five backend  
systems.

The port is a plugin for dovecot called antispam.
The five backends are:
crm114-exec
dspam-exec
mailtrain
signature-log
spool2dir

I was going to create five separate ports and conflict each port with  
the others.

Optionally I could create one port with five variants and conflict the  
variants with each other. If I use variants there must be one and only  
one of the five backends chosen. I know I can conflict variants but I  
do not know how to force a variant.

 From a naming and maintenance standpoint I like one port with five  
variants vs five ports.

dovecot-antispam

vs

dovecot-antispam-crm114
dovecot-antispam-dspam
dovecot-antispam-mailtrain
dovecot-antispam-signature
dovecot-antispam-spool2dir


I would appreciate any guidance offered.


Regards,
Bradley Giesbrecht