synfig: 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/synfig - from package: synfig

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

On Debian possible default full paths are:

/usr/bin/synfig - from package: synfig

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

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