wvDocBook: 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/wvDocBook - from package: wv

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

On Debian possible default full paths are:

/usr/bin/wvDocBook - from package: wv

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

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