There's a closed pull request on the void-packages repository

dosbox: patch to support full mapping of joysticks
https://github.com/void-linux/void-packages/pull/14474

Description:
Without this patch, dosbox is only able to use:
- either 2 joysticks/gamepads with 1 analog stick each (no hat switches/d-pads)
- or 1 joystick/gamepad with 1 analog stick and 1 hat switch/d-pad (with `joysticktype=fcs`)

This patch allows full mapping of 2 joysticks/gamepads with 2 analog sticks and 1 hat switch/d-pad, which means modern joysticks and gamepads can be fully used to play dos games in 2-player mode.

This patch is also used by Recalbox OS, see https://github.com/recalbox/recalbox-buildroot/blob/master/package/dosbox/dosbox-003-joystick-8axis.patch