rfc2047-encode.awk: 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:

/var/spool/hylafax/bin/rfc2047-encode.awk - from package: hylafax+

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

Error in other languages:
rfc2047-encode.awk: bevel nie gevind nie
rfc2047-encode.awk: comandă negăsită
rfc2047-encode.awk: comando não encontrado
rfc2047-encode.awk: commande introuvable
rfc2047-encode.awk: command not found
rfc2047-encode.awk: käsku ei ole
rfc2047-encode.awk: không tìm thấy lệnh
rfc2047-encode.awk: komanda nerasta
rfc2047-encode.awk: Kommando nicht gefunden.
rfc2047-encode.awk: kommandot finns inte
rfc2047-encode.awk: komut yok
rfc2047-encode.awk: nie znaleziono polecenia
rfc2047-encode.awk: níor aimsíodh an t-ordú
rfc2047-encode.awk: no se encontró la orden
rfc2047-encode.awk: no s'ha trobat l'ordre
rfc2047-encode.awk: opdracht niet gevonden
rfc2047-encode.awk: parancs nem található
rfc2047-encode.awk: perintah tidak ditemukan
rfc2047-encode.awk: príkaz nenájdený
rfc2047-encode.awk: příkaz nenalezen
rfc2047-encode.awk: команда не найдена
rfc2047-encode.awk: командата не е открита
rfc2047-encode.awk: 命令找不到
rfc2047-encode.awk: コマンドが見つかりません