pbmmake: 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/pbmmake - from package: netpbm-progs

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

On Debian possible default full paths are:

/usr/bin/pbmmake - from package: netpbm

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

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