maketx: 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/maketx - from package: OpenImageIO-utils

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

On Debian possible default full paths are:

/usr/bin/maketx - from package: openimageio-tools

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

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