OpenCL userspace driver as provided in the amdgpu-pro driver stack and intended to work along with the free amdgpu stack. It's a repackage of AUR opencl-amd and don't provide the full amdgpu-pro stack. The Ubuntu 18.04 drivers can be downloaded using: /usr/bin/wget --referer https://support.amd.com/en-us/kb-articles/Pages/AMDGPU-PRO-Driver-for-Linux-Release-Notes.aspx -N https://drivers.amd.com/drivers/linux/19.50/amdgpu-pro-19.50-967956-ubuntu-18.04.tar.xz