xmakemol: 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 Debian possible default full paths are:

/usr/bin/xmakemol - from package: xmakemol-gl
/usr/bin/xmakemol - from package: xmakemol

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

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