bld-pf_log: 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 Debian possible default full paths are:

/usr/sbin/bld-pf_log - from package: bld-postfix

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

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