forge_make_admin: 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/forge_make_admin - from package: gforge-db-postgresql
/usr/share/gforge/bin/forge_make_admin - from package: gforge-db-postgresql

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

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