z80-unknown-coff-strings: 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-strings - from package: binutils-z80

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

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