Can someone help me with virtual camera OBS?

Once I’ve installed manjaro I can’t see virtual camera option. So when I try to install v4l2loopback-utils, I get this error

Install DKMS modules
==> ERROR: Missing usr kernel headers for module v4l2loopback/0.12.7.

I need to see Virtual Camera option. Can someone help me?

DKMS modules need installed linux headers.

pamac search "linux*-headers"