voikkohyphenate: 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/voikkohyphenate - from package: voikko-tools

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

On Debian possible default full paths are:

/usr/bin/voikkohyphenate - from package: libvoikko-dev

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

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