Kernel configuration is invalid. include/linux/autoconf.h or include/config

[hanumant]

i am a newb and this is what i got when i tried to make a simple hello module.
core 2.6.21-1.3228.fc7

this is the full output

[gooner@localhost ~]$ make -C /usr/src/redhat/BUILD/kernel-2.6.21/vanilla M=`pwd` modules
make: Entering directory `/usr/src/redhat/BUILD/kernel-2.6.21/vanilla'

ERROR: Kernel configuration is invalid.
include/linux/autoconf.h or include/config/auto.conf are missing.
Run 'make oldconfig && make prepare' on kernel src to fix it.


WARNING: Symbol version dump /usr/src/redhat/BUILD/kernel-2.6.21/vanilla/Module.symvers
is missing; modules will have no dependencies and modversions.

scripts/Makefile.build:17: /home/gooner/Makefile: No such file or directory
make[1]: *** No rule to make target `/home/gooner/Makefile'. Stop.
make: *** [_module_/home/gooner] Error 2
make: Leaving directory `/usr/src/redhat/BUILD/kernel-2.6.21/vanilla'

what should i do???

[SteveGYBE]

Have you installed the kernel development package? These include the kernel header files - try "rpm -q kernel-devel" if you are not sure - it should come back with "kernel-devel-2.6.21-1.3228.fc7" if they are installed. If not, "yum install kernel-devel" should fix this.

If they are no longer in the default location (mine are in /usr/src/kernels/2.6.21-1.3228.fc7-i686/include), you may need to tell "make" where they are with the -I <include path> flag (Upper Case i). Worth a try even if they are there.