obs-build: 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/obs-build - from package: obs-build

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

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