wmaker: 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/wmaker - from package: WindowMaker

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

On Debian possible default full paths are:

/usr/bin/wmaker - from package: wmaker-common

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

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