convertfonts: 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/convertfonts - from package: WindowMaker

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

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