widl: 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/widl - from package: wine-devel

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

On Debian possible default full paths are:

/usr/lib/x86_64-linux-gnu/wine/bin/widl - from package: wine64-tools

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

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