botan-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/botan-config - from package: botan-devel

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

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