allegro-config: 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/allegro-config - from package: liballegro4-dev

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

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