mk_cmds: 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/mk_cmds - from package: libss-devel

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

On Debian possible default full paths are:

/usr/bin/mk_cmds - from package: ss-dev

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

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