frown software package provides LALR(k) parser generator, 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 frown
frown is installed in your system.
Make ensure the frown package were installed using the commands given below,
$ sudo dpkg-query -l | grep frown *
You will get with frown package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Development |
| Package | frown |
| Version | 0.6.2.3-4 |
| Description | LALR(k) parser generator |
| Sub Section | devel |