sdld: command not found

Have You tried accessing the binary with the full path?

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 Debian possible default full paths are:

/usr/bin/sdld - from package: sdcc

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