kconfig_compiler: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/kconfig_compiler - from package: kdelibs3-devel

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/kconfig_compiler - from package: kdelibs5-dev

You may install the required package with command apt-get install {package}

Error in other languages:
kconfig_compiler: bevel nie gevind nie
kconfig_compiler: comandă negăsită
kconfig_compiler: comando não encontrado
kconfig_compiler: commande introuvable
kconfig_compiler: command not found
kconfig_compiler: käsku ei ole
kconfig_compiler: không tìm thấy lệnh
kconfig_compiler: komanda nerasta
kconfig_compiler: Kommando nicht gefunden.
kconfig_compiler: kommandot finns inte
kconfig_compiler: komut yok
kconfig_compiler: nie znaleziono polecenia
kconfig_compiler: níor aimsíodh an t-ordú
kconfig_compiler: no se encontró la orden
kconfig_compiler: no s'ha trobat l'ordre
kconfig_compiler: opdracht niet gevonden
kconfig_compiler: parancs nem található
kconfig_compiler: perintah tidak ditemukan
kconfig_compiler: príkaz nenájdený
kconfig_compiler: příkaz nenalezen
kconfig_compiler: команда не найдена
kconfig_compiler: командата не е открита
kconfig_compiler: 命令找不到
kconfig_compiler: コマンドが見つかりません