compiling new kernel on knoppix

I installed the latest knoppix on hd with the knoppix-installer with the
debian option.
Then I installed the precompiled 2.6.4 kernel from the Debian unstable
branch.... No Problems. 

Next I installed the kernel-source-2.6.4 with apt-get, untar'd it 
ln -s kernel-source-2.6.4 linux
cd linux
cp /boot/config-2.6.4-1-k7 ./.config
make oldconfig
make menuconfig
make xconfig

and allways the same error:
[email protected]:/usr/src/linux# make oldconfig
  HOSTCC  scripts/fixdep
In Datei, eingefügt von /usr/include/sys/socket.h:35,
                    von /usr/include/netinet/in.h:24,
                    von scripts/fixdep.c:107:
/usr/include/bits/socket.h:305:24: asm/socket.h: Datei oder Verzeichnis
nicht gefunden
make[1]: *** [scripts/fixdep] Fehler 1
make: *** [scripts/fixdep] Fehler 2

Any ideas?

-didi