ppl-config: 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/ppl-config - from package: ppl

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

On Debian possible default full paths are:

/usr/bin/ppl-config - from package: ppl-dev

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

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