First you need make:

sudo apt-get install make

Then you try make menuconfig or make xconfig and you get this:
/usr/src/linux# make menuconfig
HOSTCC scripts/basic/fixdep
/bin/sh: line 1: gcc: command not found
make[1]: *** [scripts/basic/fixdep] Error 127
make: *** [scripts_basic] Error 2
» More: Make Menuconfig / XConfig Error