gsc: 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/gsc - from package: gambit-c
/usr/lib64/gambit-c/bin/gsc - from package: gambit-c

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

On Debian possible default full paths are:

/usr/bin/gsc - from package: gambc

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

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