mcpp: 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/mcpp - from package: mcpp

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

On Debian possible default full paths are:

/usr/bin/mcpp - from package: mcpp

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

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