scheme-ieee-1178-1990: 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/lib64/gambit-c/bin/scheme-ieee-1178-1990 - from package: gambit-c

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

On Debian possible default full paths are:

/usr/bin/scheme-ieee-1178-1990 - from package: gambc

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

Error in other languages:
scheme-ieee-1178-1990: bevel nie gevind nie
scheme-ieee-1178-1990: comandă negăsită
scheme-ieee-1178-1990: comando não encontrado
scheme-ieee-1178-1990: commande introuvable
scheme-ieee-1178-1990: command not found
scheme-ieee-1178-1990: käsku ei ole
scheme-ieee-1178-1990: không tìm thấy lệnh
scheme-ieee-1178-1990: komanda nerasta
scheme-ieee-1178-1990: Kommando nicht gefunden.
scheme-ieee-1178-1990: kommandot finns inte
scheme-ieee-1178-1990: komut yok
scheme-ieee-1178-1990: nie znaleziono polecenia
scheme-ieee-1178-1990: níor aimsíodh an t-ordú
scheme-ieee-1178-1990: no se encontró la orden
scheme-ieee-1178-1990: no s'ha trobat l'ordre
scheme-ieee-1178-1990: opdracht niet gevonden
scheme-ieee-1178-1990: parancs nem található
scheme-ieee-1178-1990: perintah tidak ditemukan
scheme-ieee-1178-1990: príkaz nenájdený
scheme-ieee-1178-1990: příkaz nenalezen
scheme-ieee-1178-1990: команда не найдена
scheme-ieee-1178-1990: командата не е открита
scheme-ieee-1178-1990: 命令找不到
scheme-ieee-1178-1990: コマンドが見つかりません