makeconv: 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/makeconv - from package: icu

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

On Debian possible default full paths are:

/usr/bin/makeconv - from package: icu-devtools

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

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