binutils-z80 software package provides GNU binary utilities for the z80-unknown-coff target, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install binutils-z80
binutils-z80 is installed in your system.
Make ensure the binutils-z80 package were installed using the commands given below,
$ sudo dpkg-query -l | grep binutils-z80 *
You will get with binutils-z80 package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Development |
| Package | binutils-z80 |
| Version | 2.25.1-1+4 [mips64el], 2.25-5+ |
| Description | GNU binary utilities for the z80-unknown-coff target |
| Sub Section | devel |