krb5-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/lib/heimdal/bin/krb5-config - from package: heimdal-devel
/usr/bin/krb5-config - from package: krb5-devel

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

On Debian possible default full paths are:

/usr/bin/krb5-config - from package: heimdal-dev
/usr/bin/krb5-config - from package: libkrb5-dev

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

Error in other languages:
krb5-config: bevel nie gevind nie
krb5-config: comandă negăsită
krb5-config: comando não encontrado
krb5-config: commande introuvable
krb5-config: command not found
krb5-config: käsku ei ole
krb5-config: không tìm thấy lệnh
krb5-config: komanda nerasta
krb5-config: Kommando nicht gefunden.
krb5-config: kommandot finns inte
krb5-config: komut yok
krb5-config: nie znaleziono polecenia
krb5-config: níor aimsíodh an t-ordú
krb5-config: no se encontró la orden
krb5-config: no s'ha trobat l'ordre
krb5-config: opdracht niet gevonden
krb5-config: parancs nem található
krb5-config: perintah tidak ditemukan
krb5-config: príkaz nenájdený
krb5-config: příkaz nenalezen
krb5-config: команда не найдена
krb5-config: командата не е открита
krb5-config: 命令找不到
krb5-config: コマンドが見つかりません