gfortran-powerpc64le-linux-gnu software package provides GNU Fortran 95 compiler for the ppc64el 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 gfortran-powerpc64le-linux-gnu
gfortran-powerpc64le-linux-gnu is installed in your system.
Make ensure the gfortran-powerpc64le-linux-gnu package were installed using the commands given below,
$ sudo dpkg-query -l | grep gfortran-powerpc64le-linux-gnu*
You will get with gfortran-powerpc64le-linux-gnu package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Development |
| Package | gfortran-powerpc64le-linux-gnu |
| Version | 4:6.1.1-1 |
| Description | GNU Fortran 95 compiler for the ppc64el architecture |
| Sub Section | devel |