gifburst: 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/gifburst - from package: giflib-utils

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

On Debian possible default full paths are:

/usr/bin/gifburst - from package: giflib-tools

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

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