Permissions on /usr/local/www gets modified by a ports installation

[FreeBSD]

Hi list!

I just noticed a strange behaviour after the installation of
/usr/ports/devel/subversion. Before the installation, the permissions on
the /usr/local/www folder are:

drwxrwxr-x   6 root  psm     2560 Apr  2 15:55 www

and right after the installation the folder is set with the "default"
permissions/group:

drwxr-xr-x   6 root  wheel   2560 Apr  2 15:55 www

I just reproduced it on another FreeBSD 7.1-RELEASE box with generic kernel.

Can someone shed some light on this?

Thanks a lot for sharing :)

Martin