ZDoom

Thank you, Blzut3 and Rachael!
Everything works fine now!
:D

Greetings
Funduke

[quote="Rachael"]Making a package takes a lot of time for me and I have no automated process to do it, so I simply did not bother.[/quote]
If you have any interest in doing it, look at ECWolf's usage of CPack. Starting with CMake 3.11 it's possible to make deb packages that pass lintian.

sudo apt-get install libomp5

sudo apt-get install libfluidsynth1 libopenal1  libc6 libgomp1 libsdl2-2.0-0 zlib1g libbz2-1.0 libasound2 libsndfile1 libmpg123-0

[quote="Blzut3"]It is. libomp5.

Since it's not packaged you're on your own as far as installing dependencies.[/quote]
Which is really simple to do.

Open a terminal and type the following:
[code]sudo apt-get install libomp5[/code]

Get some other dependencies while you're at it, as well: (list taken from GZDoom's install package)
[code]sudo apt-get install libfluidsynth1 libopenal1 libc6 libgomp1 libsdl2-2.0-0 zlib1g libbz2-1.0 libasound2 libsndfile1 libmpg123-0[/code]

It's safe to type this command even if you already have the relevant packages installed, it will simply skip installing them if you have them.

Making a package takes a lot of time for me and I have no automated process to do it, so I simply did not bother.

It is. libomp5.

Since it's not packaged you're on your own as far as installing dependencies.

Suspecting there's a dependency not installed; a brief Google search is telling me this belongs to OpenMP. Is that installed/available via APT?

I downloaded the linux version and tried it on Ubuntu 18.04.
It did not work.
It responded this:

[quote]
./raze
./raze: error while loading shared libraries: libomp.so.5: cannot open shared object file: No such file or directory
[/quote]

How can i solve that problem?

Greetings
Funduke