gifclrmp: 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/gifclrmp - from package: giflib-utils

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

On Debian possible default full paths are:

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

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

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