Setting up vulkan

Hi,
Sorry if i sound vague in any part, i am completely new.
I have recently started using manjaro-kde and i have set up optimus-manager and it works fine. But vulkan-caps-viewer only shows me Intel graphics and not my dGPU. After some searching somewhere i saw that i need to install nvidia-vulkan and the lib32-nvidia-vulkan-utils for it. However, when its installing i get an error saying

make: *** [Makefile:81: modules] Error 2
==> ERROR: A failure occurred in build().
    Aborting..

Where and in what context, what system, what hardware?

Before you move on, please provide from terminal:
inxi -Fxxxza --no-host
mhwd -li

Make sure you read this part
https://wiki.manjaro.org/index.php?title=Optimus_Manager
and mostly this part to understand what is going on with vulkan

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