Keyboard / xkbcomp trouble with xorg 6.9

[Tino Boss]

Hi all,
I have 5.4 and recently upgraded my ports. Now my keyboard settings in X 
don't work properly anymore. It seems I lost my swiss-german keyboard 
layout and have a german one now, so it's kind of half-functional. For 
example it's not possible to switch to the console by  Ctrl-Alt-F1. 
After killing X I can see the the following msg on ttyv0:

The XKEYBOARD keymap compiler (xkbcomp) reports:
 > Error:            Can't find file "pc/de_CH" for symbols include
 >                   Exiting
 >                   Abandoning symbols file "default"


settings in xorg.conf:
    Option "XkbRules"   "xorg"
    Option "XkbModel"   "pc105"
    Option "XkbLayout"  "de_CH"

the following file is present:
/usr/X11R6/lib/X11/xkb/symbols/de_CH

X installed:
xorg-clients-6.9.0_1
xorg-server-6.9.0


Any hints?

regards
Tino