Cannot run build as described in the README.md

[Kagukara]

I would like to be able to test gamescope without installing it. On the Building section of the README.md it shows that this is possible.

When running build/gamescope -- glxgears (build/gamescope -- <game>) I get:

bash: build/gamescope: No such file or directory

When looking through the ../build folder gamescope is located in ../build/src. When running build/src/gamescope -- glxgears it starts but then gives the error:

[gamescope] [Error] process: Failed to start process "gamescopereaper": No such file or directory

How are you suppose to run gamescope if what is said in the Building section of the README.md is wrong/not working?

[matte-schwartz]

The first part will be addressed in my readme PR, while the second part is actually something I'm not totally sure about the best way to deal with. For example, PATH=./build/src:$PATH gamescope -- vkcube will let you run the gamescope binary, but it won't be able to know where to look for the WSI layer without installing. The library directories are determined by the prefix you give to meson during configuration, so the .json file for the layer is directed to your libdir rather than the build/layer directory. I'll see if I can figure out a way to get this to work without affecting the ability to install the layers that get compiled during the build.

[matte-schwartz]

@misyltoad any ideas for running local gamescope in a way that doesn't require you to install system gamescope first in order to find the utility executables and the WSI layer? or should we just structure the readme in a way that only promotes installing to a local directory (like MangoHud does here: https://github.com/flightlessmango/MangoHud?tab=readme-ov-file#installation---build-from-source) and how to configure that