hevea: 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/hevea - from package: hevea

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

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