Notify one compile error

I am trying to compile Comedi 0.7.73 on kernel 2.6.20-16-generic  (Ubuntu)
for several days.
But always fail for this error.
I already recompile my kernel. and try the way "  echo "         Run 'make
oldconfig && make prepare' on kernel src to fix it.";  \ " But still have
this error.
Looking forward to your suggestion!
Thank you.

Jayson



make  all-recursive
make[1]: Entering directory `/home/jienan/Project/comedi-0.7.73'
Making all in comedi
make[2]: Entering directory `/home/jienan/Project/comedi- 0.7.73/comedi'
Making all in .
make[3]: Entering directory `/home/jienan/Project/comedi-0.7.73/comedi'
echo > comedi_kbuild.inc
echo CONFIG_COMEDI_PCMCIA_MODULES=m >> comedi_kbuild.inc
echo CONFIG_COMEDI_USB_MODULES=m >> comedi_kbuild.inc
make -I/home/jienan/Project/comedi-0.7.73/comedi -C
/lib/modules/2.6.20-16-generic/build
M=/home/jienan/Project/comedi-0.7.73/comedi
CC="gcc -m32 -I/home/jienan/Project/comedi-0.7.73/ \
                -I/home/jienan/Project/comedi- 0.7.73/include  " V=1 modules
make[4]: Entering directory `/usr/src/linux-headers-2.6.20-16-generic'
test -e include/linux/autoconf.h -a -e include/config/auto.conf ||
(           \
        echo;                                                           \
        echo "  ERROR: Kernel configuration is invalid.";               \
        echo "         include/linux/autoconf.h or include/config/auto.conf
are missing.";      \
        echo "         Run 'make oldconfig && make prepare' on kernel src to
fix it.";  \
        echo;                                                           \
        /bin/false)
mkdir -p /home/jienan/Project/comedi-0.7.73/comedi/.tmp_versions
rm -f /home/jienan/Project/comedi-0.7.73/comedi/.tmp_versions/*
make -f scripts/Makefile.build obj=/home/jienan/Project/comedi-0.7.73/comedi
  gcc -m32 -I/home/jienan/Project/comedi-0.7.73/
-I/home/jienan/Project/comedi-0.7.73/include
-Wp,-MD,/home/jienan/Project/comedi- 0.7.73/comedi/.comedi_fops.o.d
-nostdinc -isystem /usr/lib/gcc/i486-linux-gnu/4.1.2/include -D__KERNEL__
-Iinclude  -include include/linux/autoconf.h -Iubuntu/include  -Wall -Wundef
-Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -O2
-pipe -msoft-float -mregparm=3 -mpreferred-stack-boundary=2  -march=i586
-mtune=generic -ffreestanding -maccumulate-outgoing-args
-Iinclude/asm-i386/mach-default -fomit-frame-pointer -g
-fno-stack-protector -Wdeclaration-after-statement -Wno-pointer-sign
-DMODULE -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(comedi_fops)"
-D"KBUILD_MODNAME=KBUILD_STR(comedi)" -c -o /home/jienan/Project/comedi-
0.7.73/comedi/.tmp_comedi_fops.o /home/jienan/Project/comedi-0.7.73
/comedi/comedi_fops.c
In file included from /home/jienan/Project/comedi-0.7.73
/include/linux/comedidev.h:30,
                 from /home/jienan/Project/comedi- 0.7.73
/comedi/comedi_fops.c:44:
/home/jienan/Project/comedi-0.7.73/include/linux/config.h:5:31: error:
linux/config.h: No such file or directory
make[5]: *** [/home/jienan/Project/comedi-0.7.73/comedi/comedi_fops.o] Error
1
make[4]: *** [_module_/home/jienan/Project/comedi-0.7.73/comedi] Error 2
make[4]: Leaving directory `/usr/src/linux-headers-2.6.20-16-generic'
make[3]: *** [all-local] Error 2
make[3]: Leaving directory `/home/jienan/Project/comedi- 0.7.73/comedi'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/home/jienan/Project/comedi-0.7.73/comedi'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/jienan/Project/comedi- 0.7.73'
make: *** [all] Error 2