mozilla - bind conflict _

[Vizion]

Hi

I am having problems upgrading mozilla-1.7.13,2 ro mozilla-1.7.13_1,2 (www/mozilla)

Build fails
mozilla-1.7..13_1,2: bind installed with PORT_REPLACES_BASE_BIND causes problems.

I first recompiled bind9 without this option but got the same failure. 

Then I deinstalled bind9 entirely and retried the portupgrade after portsclean -C only to get the same failure.

Suggestions please

Thanks
david