Latest XFree86 version vs today's portupgraded version

[Stacey Roberts]

Hello,
     I am not able to configure X on my laptop (HP OmniBook XE2), which
coredumps when I run "XFree86 -xf86config XF86Config.new".

The folks at XFree86 believe that this is fixed (see [Bug 159] Silicon
Motion SMI Lynx SM811 unconfigurable in XFree86 Version 4.3.0) and
suggest that I try the latest XFree86 in cvs.

What I currently have installed is:
Information for XFree86-4.3.0,1:
Comment:
X11/XFree86 core distribution (complete, using mini/meta-ports)
Description:
XFree86 is a added-value pack for X11R6 that supports several versions
of Intel-based Unix and Unix-like operating systems.  
WWW: http://www.xfree86.org/
Note: 
This the complete tarball, the distribution is also available in parts


So here's my question:

With XFree86 already installed on the machine, how would I go about
installing whatever I get from cvs?

Do I need to deinstall (pkg_delete) the currently installed XFree86
first?

Can I install over the currently installed version?

This last question is out of my own curiousity as its the first time I'm
attempting this:
I've been to the ftp site at XFree86, and the docs at
ftp://xfree86.org/pub/XFree86/4.3.0 appear to be (dated) the same as the
version I already have installed on the machine at the moment. Is it
possible that the latest cvs version is *not* actually different (hence
containing the fix I require) to my currently installed version?

Thanks for the time.

Regards,

Stacey
-- 
Stacey Roberts
B.Sc (HONS) Computer Science

Web: www.vickiandstacey.com