helpviewer.app software package provides Online help viewer for GNUstep programs, 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 helpviewer.app
helpviewer.app is installed in your system.
Make ensure the helpviewer.app package were installed using the commands given below,
$ sudo dpkg-query -l | grep helpviewer.app *
You will get with helpviewer.app package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | GNUstep |
| Package | helpviewer.app |
| Version | 0.3-8+b2 [s390x], 0.3-8+b1 [am |
| Description | Online help viewer for GNUstep programs |
| Sub Section | gnustep |
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