Ports changing permissions on directories

[Andrea Venturoli]

Hello.

There are some ports that insist on changing permissions on some 
directories.
An example is clamav, which will always change /var/db/clamav mask to 755.

Since I always need to "chmod 775 /var/db/clamav" after an upgrade, I'm 
asking:
_ where does this come from? I tried to look into Makefile, but didn't 
get to it;
_ is this something FreeBSD specific or coming from upstream?
_ what's the rationale behind this?
_ can this be avoided or tweaked?


  bye & Thanks
	av.

P.S. Another example would be squid.