gsc-script: 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/gsc-script - 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-script - from package: gambc

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

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