dtc: 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/dtc - from package: dtc

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

On Debian possible default full paths are:

/usr/bin/dtc - from package: device-tree-compiler

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

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