wvDVI: 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/wvDVI - from package: wv

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

On Debian possible default full paths are:

/usr/bin/wvDVI - from package: wv

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

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