buildworld fails on FreeBSD-4.9 stable

[Tomaz Borstnar]

skrueger at xxxxxxxxxx pravi:
  You've gotten yourself in a bind.  If you are trying to upgrade a
  4.x box into DragonFly you can't mix 4.x binaries and DFly header files.
  The initial buildworld and buildkernel must be done in a 4.x environment.
  By ripping up the include files and installing just the DFly includes, 
  but still running on a 4.x system, you've created a mixed environment
  and all sorts of things are not going to build properly.
I just followed http://www.shiningsilence.com/dbsdlog/archives/000009.html,
but anyway, I've # everything in /etc/make.conf; restored FreeBSD-4.9 headers
in /usr/include and tried again, still the same failure
Use 4.8-release and it will work for sure. I did it this week. I renamed 
freebsd includes and installed dfly includes and installed everything on 
new (empty) partition and it worked as you can read in my comment on 
that page.

Tomaž