gcc-5-hppa64 software package provides virtual package provided by gcc-6-hppa64-linux-gnu, gcc-5-hppa64-linux-gnu, 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 gcc-5-hppa64
gcc-5-hppa64 is installed in your system.
Make ensure the gcc-5-hppa64 package were installed using the commands given below,
$ sudo dpkg-query -l | grep gcc-5-hppa64*
You will get with gcc-5-hppa64 package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Virtual packages |
| Package | gcc-5-hppa64 |
| Version | |
| Description | virtual package provided by gcc-6-hppa64-linux-gnu, gcc-5-hppa64-linux-gnu |
| Sub Section | Virtual |