cvtenc: 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/cvtenc - from package: gnustep-base

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

On Debian possible default full paths are:

/usr/bin/cvtenc - from package: gnustep-base-runtime

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

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