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Date: Thu, 24 Sep 2020 17:32:00 +0200
From: Solar Designer <>
Subject: Re: Fwd: John not detecting AMD OpenCL devices on Ubuntu 20

Hi James,

On Thu, Sep 24, 2020 at 03:23:11PM +0100, James Haigh wrote:
> Hoping someone might be able to help with this. Bit of a Linux amateur here
> but I've set myself up a new Ubuntu install and want to get John working on
> it with my AMD CPU (Ryzen 5) and GPU (RX570). Both devices support OpenCL
> and after a lot of hassle I got them both installed within the default
> directory at */opt/* (pastebin <>).
> When I run the *./configure* script in John's */src/* folder, it runs
> through all the checks and outputs the list of optional features in which
> OpenCL is not enabled (pastebin <>). Both
> *Hashcat* and *clinfo* detect both of the devices (pastebin
> <>), but John simply will not.

It looks like you need this:

sudo apt-get -y install opencl-headers

hashcat bundles OpenCL headers with itself, whereas John currently
expects them from the system.

Does this help?

> I've tried setting the 'ATISTREAMSDKROOT' environment variable, providing
> LD & CFLAGS to the configure script, reinstallation of my openCL packages
> (plus several hours of Googling/hoping SUDO might fix things) but nothing
> has worked as of yet.

Please don't override CFLAGS.  When you do, you most likely end up
dropping our optimization flags, resulting in inefficient CPU usage.
Please use CPPFLAGS instead.


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