mit-scheme-x86-64: 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/mit-scheme-x86-64 - from package: mit-scheme

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

Error in other languages:
mit-scheme-x86-64: bevel nie gevind nie
mit-scheme-x86-64: comandă negăsită
mit-scheme-x86-64: comando não encontrado
mit-scheme-x86-64: commande introuvable
mit-scheme-x86-64: command not found
mit-scheme-x86-64: käsku ei ole
mit-scheme-x86-64: không tìm thấy lệnh
mit-scheme-x86-64: komanda nerasta
mit-scheme-x86-64: Kommando nicht gefunden.
mit-scheme-x86-64: kommandot finns inte
mit-scheme-x86-64: komut yok
mit-scheme-x86-64: nie znaleziono polecenia
mit-scheme-x86-64: níor aimsíodh an t-ordú
mit-scheme-x86-64: no se encontró la orden
mit-scheme-x86-64: no s'ha trobat l'ordre
mit-scheme-x86-64: opdracht niet gevonden
mit-scheme-x86-64: parancs nem található
mit-scheme-x86-64: perintah tidak ditemukan
mit-scheme-x86-64: príkaz nenájdený
mit-scheme-x86-64: příkaz nenalezen
mit-scheme-x86-64: команда не найдена
mit-scheme-x86-64: командата не е открита
mit-scheme-x86-64: 命令找不到
mit-scheme-x86-64: コマンドが見つかりません