make[1]: Leaving directory `/usr/src/linux-source-2.6.18'
/usr/bin/make EXTRAVERSION=-u15254048  CROSS_COMPILE=x86_64-linux- ARCH=x86_64 prepare
make[1]: x86_64-linux-gcc: Command not found
make[1]: Entering directory `/usr/src/linux-source-2.6.18'
scripts/kconfig/conf -s arch/x86_64/Kconfig
make[1]: Leaving directory `/usr/src/linux-source-2.6.18'
make[1]: x86_64-linux-gcc: Command not found
make[1]: Entering directory `/usr/src/linux-source-2.6.18'
  CHK     include/linux/version.h
  UPD     include/linux/version.h
  CHK     include/linux/utsrelease.h
  UPD     include/linux/utsrelease.h
  SYMLINK include/asm -> include/asm-x86_64
  CC      arch/x86_64/kernel/asm-offsets.s
/bin/sh: line 1: x86_64-linux-gcc: command not found
make[2]: *** [arch/x86_64/kernel/asm-offsets.s] Error 127
make[1]: *** [prepare0] Error 2