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Date: Fri, 23 Oct 2015 09:57:54 +0100 (BST)
From: Anton Shterenlikht <mexas@bris.ac.uk>
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To: freebsd-questions@freebsd.org, leventelist@gmail.com
Subject: Re: graphviz
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>If I run dot -c, I get the same error message:
>
>Unable to find pthread_create symbol. Aborting.
>Abort trap (core dumped)
>
>Is this the same as this bug?
>
>https://lists.freebsd.org/pipermail/freebsd-ports/2013-February/081302.html

This is a very old thread.
The latest PR is this:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=202944

The workaround is to build manually with nvidia-threads
enabled.

Anton