Getting /usr/src/ from SVN directly?

Sat Mar 26 03:06:22 UTC 2011

> Use devel/subversion-freebsd though so it expands the $FreeBSD$ RCS tag.

I just did that.  I am afraid however that all of my files in /etc
will have a different RCS tag.  For example, I got /usr/src/ via SVN
directly (head, or CURRENT) and did a mergemaster prebuildworld step,
and I get this diff in /etc/group:

-# $FreeBSD: src/etc/group,v 1.36 2011/01/28 22:28:12 pjd Exp $
+# $FreeBSD: head/etc/group 218046 2011-01-28 22:28:12Z pjd $

Is there any way that these diffs can be avoided?  Is the only real
solution to just go through mergemaster file-by-file and install all
of the new ones [even though they differ only in this tag]?