qp-encode.awk: command not found

Have You tried accessing the binary with the full path?

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:

/var/spool/hylafax/bin/qp-encode.awk - from package: hylafax+

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

On Debian possible default full paths are:

/var/spool/hylafax/bin/qp-encode.awk - from package: hylafax-server

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