z80-unknown-coff-size: 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 Debian possible default full paths are:

/usr/bin/z80-unknown-coff-size - from package: binutils-z80

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

Error in other languages:
z80-unknown-coff-size: bevel nie gevind nie
z80-unknown-coff-size: comandă negăsită
z80-unknown-coff-size: comando não encontrado
z80-unknown-coff-size: commande introuvable
z80-unknown-coff-size: command not found
z80-unknown-coff-size: käsku ei ole
z80-unknown-coff-size: không tìm thấy lệnh
z80-unknown-coff-size: komanda nerasta
z80-unknown-coff-size: Kommando nicht gefunden.
z80-unknown-coff-size: kommandot finns inte
z80-unknown-coff-size: komut yok
z80-unknown-coff-size: nie znaleziono polecenia
z80-unknown-coff-size: níor aimsíodh an t-ordú
z80-unknown-coff-size: no se encontró la orden
z80-unknown-coff-size: no s'ha trobat l'ordre
z80-unknown-coff-size: opdracht niet gevonden
z80-unknown-coff-size: parancs nem található
z80-unknown-coff-size: perintah tidak ditemukan
z80-unknown-coff-size: príkaz nenájdený
z80-unknown-coff-size: příkaz nenalezen
z80-unknown-coff-size: команда не найдена
z80-unknown-coff-size: командата не е открита
z80-unknown-coff-size: 命令找不到
z80-unknown-coff-size: コマンドが見つかりません