guile-1.8: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

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/guile-1.8 - from package: guile-1.8

You may install the required package with command apt-get install {package}
Error in other languages:
guile-1.8: bevel nie gevind nie
guile-1.8: comandă negăsită
guile-1.8: comando não encontrado
guile-1.8: commande introuvable
guile-1.8: command not found
guile-1.8: käsku ei ole
guile-1.8: không tìm thấy lệnh
guile-1.8: komanda nerasta
guile-1.8: Kommando nicht gefunden.
guile-1.8: kommandot finns inte
guile-1.8: komut yok
guile-1.8: nie znaleziono polecenia
guile-1.8: níor aimsíodh an t-ordú
guile-1.8: no se encontró la orden
guile-1.8: no s'ha trobat l'ordre
guile-1.8: opdracht niet gevonden
guile-1.8: parancs nem található
guile-1.8: perintah tidak ditemukan
guile-1.8: príkaz nenájdený
guile-1.8: příkaz nenalezen
guile-1.8: команда не найдена
guile-1.8: командата не е открита
guile-1.8: 命令找不到
guile-1.8: コマンドが見つかりません