gvmap: 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/gvmap - from package: graphviz

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

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