root:/ex_disk/linux-3.5.2# make headers_check
  CHK     include/linux/version.h
  HOSTCC  scripts/basic/fixdep
gcc: error trying to exec 'cc1': execvp: No such file or directory
make[1]: *** [scripts/basic/fixdep] Error 1
make: *** [scripts_basic] Error 2

root:/ex_disk/linux-3.5.2# find / | egrep cc1$
/tools/libexec/gcc/i686-lfs-linux-gnu/4.7.1/cc1
/tools/libexec/gcc/i686-pc-linux-gnu/4.7.1/cc1
/tools/share/terminfo/x/xterm+pcc1
root:/ex_disk/linux-3.5.2#

root:/ex_disk/linux-3.5.2# export
declare -x HOME="/root"
declare -x OLDPWD="/ex_disk"
declare -x PATH="/bin:/usr/bin:/sbin:/usr/sbin:/tools/bin"
declare -x PS1="\\u:\\w\\\$ "
declare -x PWD="/ex_disk/linux-3.5.2"
declare -x SHLVL="1"
declare -x TERM="xterm"