Problem building kernel

Dear all,

I just tried to build world and kernel on a 64-bit PPC system.

make -j 32 buildworld

ran without problems.
However

make kernel KERNCONF=GENERIC

breaks with
...
--- all_subdir_accf_data ---
--- accf_data.kld ---
ld -m elf32ppc_fbsd -warn-common --build-id=sha1 --no-toc-optimize  -r  -o accf_data.kld accf_data.o
--- all_subdir_acl_nfs4 ---
--- offset.inc ---
sh /usr/home/tuexen/freebsd-src/sys/kern/genoffset.sh genoffset.o > offset.inc
--- all_subdir_accf_data ---
ld: error: accf_data.o is incompatible with elf32ppc_fbsd
*** [accf_data.kld] Error code 1

make[4]: stopped in /usr/home/tuexen/freebsd-src/sys/modules/accf_data
       5.79 real        22.37 user        15.35 sys

make[1]: stopped in /usr/home/tuexen/freebsd-src

make: stopped in /usr/home/tuexen/freebsd-src
tuexen@blackbird:

Any idea what is going wrong?

Best regards
Michael