error in oldconfig

Hi, Why this appear to me when I use make oldconfig : *** Error during writing of the configuration. make[2]: *** [silentoldconfig] Error 1 make[1]: *** [silentoldconfig] Error 2 mkdir: cannot create directory `arch/x86/syscalls/../include/generated': Permission denied mkdir: cannot create directory `arch/x86/syscalls/../include/generated': Permission denied SYSHDR arch/x86/syscalls/../include/generated/uapi/asm/unistd_32.h /usr/src/linux-3.13.11/arch/x86/syscalls/syscallhdr.sh: line 27: arch/x86/syscalls/../include/generated/uapi/asm/unistd_32.h: No such file or directory make[1]: *** [arch/x86/syscalls/../include/generated/uapi/asm/unistd_32.h] Error 1 make: *** [archheaders] Error 2 Thanks