sdcc-sstm8: 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/sdcc-sstm8 - from package: sdcc

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

Error in other languages:
sdcc-sstm8: bevel nie gevind nie
sdcc-sstm8: comandă negăsită
sdcc-sstm8: comando não encontrado
sdcc-sstm8: commande introuvable
sdcc-sstm8: command not found
sdcc-sstm8: käsku ei ole
sdcc-sstm8: không tìm thấy lệnh
sdcc-sstm8: komanda nerasta
sdcc-sstm8: Kommando nicht gefunden.
sdcc-sstm8: kommandot finns inte
sdcc-sstm8: komut yok
sdcc-sstm8: nie znaleziono polecenia
sdcc-sstm8: níor aimsíodh an t-ordú
sdcc-sstm8: no se encontró la orden
sdcc-sstm8: no s'ha trobat l'ordre
sdcc-sstm8: opdracht niet gevonden
sdcc-sstm8: parancs nem található
sdcc-sstm8: perintah tidak ditemukan
sdcc-sstm8: príkaz nenájdený
sdcc-sstm8: příkaz nenalezen
sdcc-sstm8: команда не найдена
sdcc-sstm8: командата не е открита
sdcc-sstm8: 命令找不到
sdcc-sstm8: コマンドが見つかりません