gdc-multilib-powerpc64-linux-g software package provides GNU D compiler (based on GCC) for the ppc64 architecture, 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 gdc-multilib-powerpc64-linux-g
gdc-multilib-powerpc64-linux-g is installed in your system.
Make ensure the gdc-multilib-powerpc64-linux-g package were installed using the commands given below,
$ sudo dpkg-query -l | grep gdc-multilib-powerpc64-linux-g*
You will get with gdc-multilib-powerpc64-linux-g package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Development |
| Package | gdc-multilib-powerpc64-linux-g |
| Version | 4:6.1.1--2 |
| Description | GNU D compiler (based on GCC) for the ppc64 architecture |
| Sub Section | devel |