[Bug 203537] [PATCH] graphics/graphviz: Enable NVTHREADS by default

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203537

            Bug ID: 203537
           Summary: [PATCH] graphics/graphviz: Enable NVTHREADS by default
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Keywords: patch
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: dinoex at FreeBSD.org
          Reporter: tobias.kortkamp at gmail.com
          Assignee: dinoex at FreeBSD.org
             Flags: maintainer-feedback?(dinoex at FreeBSD.org)
          Keywords: patch

Created attachment 161702
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=161702&action=edit
graphviz.diff

Currently installing Graphviz via pkg on a FreeBSD 10.2 system with
x11/nvidia-driver installed fails with:

[1/1] Extracting graphviz-2.38.0_9: 100%
Unable to find pthread_mutexattr_setkind_np versioned symbol. Aborting.
Abort trap (core dumped)

Graphviz is unusable afterwards. Recompiling Graphviz with the NVTHREADS option
fixes this. Also see bug #171949. 

Can we enable NVTHREADS by default? AFAICT Graphviz with NVTHREADS will work
fine even on non-NVIDIA systems. Are there any downsides to enabling this by
default?

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