gifpos: 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/gifpos - from package: giflib-utils

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

On Debian possible default full paths are:

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

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

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