Ok, I figured it out ... you were right:
My guile-2.0-libs package was somehow corrupted/not correctly installed.
So running guile showed some errors ...

After fixing this issue by purging the package and reinstalling it I can
run make install successfully...

Thanks a lot...

Matthias

On Mon, 2013-09-23 at 17:58 +0200, Ludovic Courtès wrote:
> Matthias Wachs <wachs@net.in.tum.de> skribis:
> 
> > with git f59e9eaac87b4365c646a475d44b431e43949649
> > on Ubuntu 13.04 /w guile 2.0.7:
> >
> > [apply-smob/1 #<boot-closure 9d3a60 (_ _ _)> #t ...]
> >    ?: 7 [apply-smob/1 #<catch-closure 9a96c0>]
> >    ?: 6 [primitive-eval ((@ # %) (begin # # #))]
> > In /usr/bin/guild:
> >   59: 5 [main ("/usr/bin/guild" "compile" "-L" ...)]
> > In unknown file:
> >    ?: 4 [apply-smob/1 #<boot-closure b897a0 (_)> (scripts compile)
> > #:ensure #f]
> >    ?: 3 [primitive-load-path "scripts/compile" #f]
> > In scripts/compile.scm:
> >   31: 2 [#<procedure 12e56a0 ()>]
> > In unknown file:
> >    ?: 1 [apply-smob/1 #<boot-closure b4d3c0 (_)> (scripts compile) ...]
> >    ?: 0 [scm-error misc-error #f ...]
> >
> > ERROR: make[2]: *** [guix/scripts/build.go] Error 1
> 
> This (the #<boot-closure ...> thing) suggests that Guile was not
> installed correctly.
> 
> Are you able to run just ‘guile’ and get a REPL prompt?  Do you see
> loads of messages about files getting compiled?
> 
> TIA,
> Ludo’.

-- 
Dipl.-Inf. Matthias Wachs
Free Secure Network Systems Group
Technische Universitaet Muenchen
Chair for Network Architectures and Services
Institute for Informatics / I8           Tel:    +49 89 289 18037
Boltzmannstr. 3 / Room 03.05.042         Fax:    +49 89 289 18033
D-85748 Garching b. Muenchen, Germany    Email: wachs@net.in.tum.de