mcomp: 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/mcomp - from package: mtools

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

On Debian possible default full paths are:

/usr/bin/mcomp - from package: mtools

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

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