grep: /usr/src/linux/include/linux/autoconf.h: No such file or directory
gcc     gendigits.c  -lm -o gendigits
./gendigits > tones.h
gcc -o makefw makefw.c
./makefw tormenta2.rbt tor2fw > tor2fw.h
Loaded 69900 bytes from file
./makefw pciradio.rbt radfw > radfw.h
Loaded 42096 bytes from file
make -C /usr/src/linux SUBDIRS=/usr/src/asterisk/zaptel-1.4.0 modules
make[1]: Entering directory `/usr/src/linux-source-2.6.18'

  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/linux-source-2.6.18/Module.symvers
           is missing; modules will have no dependencies and modversions.

grep: /usr/src/linux/include/linux/autoconf.h: No such file or directory
  CC [M]  /usr/src/asterisk/zaptel-1.4.0/pciradio.o
cc1: error: include/linux/autoconf.h: No such file or directory
In file included from include/linux/kernel.h:11,
                 from /usr/src/asterisk/zaptel-1.4.0/pciradio.c:46:
include/linux/linkage.h:4:25: error: asm/linkage.h: No such file or directory
In file included from include/linux/posix_types.h:47,
                 from include/linux/types.h:14,
                 from include/linux/kernel.h:13,
                 from /usr/src/asterisk/zaptel-1.4.0/pciradio.c:46:
/usr/lib/gcc/i486-linux-gnu/4.1.2/include/asm/posix_types.h:13:22: error: features.h: No such file or directory
/usr/lib/gcc/i486-linux-gnu/4.1.2/include/asm/posix_types.h:14:35: error: no include path in which to search for asm/posix_types.h
In file included from include/linux/kernel.h:13,
                 from /usr/src/asterisk/zaptel-1.4.0/pciradio.c:46:
include/linux/types.h:15:23: error: asm/types.h: No such file or directory