evolver: 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/evolver - from package: evolver

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

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