cpp-6-arm-linux-gnueabi software package provides GNU C preprocessor, 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 cpp-6-arm-linux-gnueabi
cpp-6-arm-linux-gnueabi is installed in your system.
Make ensure the cpp-6-arm-linux-gnueabi package were installed using the commands given below,
$ sudo dpkg-query -l | grep cpp-6-arm-linux-gnueabi *
You will get with cpp-6-arm-linux-gnueabi package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Development |
| Package | cpp-6-arm-linux-gnueabi |
| Version | 6.1.1-9cross1 |
| Description | GNU C preprocessor |
| Sub Section | devel |