apu-1-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/apu-1-config - from package: apr-util-devel

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

On Debian possible default full paths are:

/usr/bin/apu-1-config - from package: libaprutil1-dev

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

Error in other languages:
apu-1-config: bevel nie gevind nie
apu-1-config: comandă negăsită
apu-1-config: comando não encontrado
apu-1-config: commande introuvable
apu-1-config: command not found
apu-1-config: käsku ei ole
apu-1-config: không tìm thấy lệnh
apu-1-config: komanda nerasta
apu-1-config: Kommando nicht gefunden.
apu-1-config: kommandot finns inte
apu-1-config: komut yok
apu-1-config: nie znaleziono polecenia
apu-1-config: níor aimsíodh an t-ordú
apu-1-config: no se encontró la orden
apu-1-config: no s'ha trobat l'ordre
apu-1-config: opdracht niet gevonden
apu-1-config: parancs nem található
apu-1-config: perintah tidak ditemukan
apu-1-config: príkaz nenájdený
apu-1-config: příkaz nenalezen
apu-1-config: команда не найдена
apu-1-config: командата не е открита
apu-1-config: 命令找不到
apu-1-config: コマンドが見つかりません