$OpenBSD: README-main,v 1.1 2012/08/22 09:55:01 edd Exp $

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| Running graphviz-2.36.0p2 on OpenBSD
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Threading Linkage for Language Bindings
=======================================

If you require a language binding for a language which does not support
multi-threading (at the moment, that is in-base perl and the default
flavoured tcl package), then you must use the LD_PRELOAD environment
variable to preload libpthread.

Eg. LD_PRELOAD=/usr/lib/libpthread.so perl some_graphviz_script.pl

This is because a host binary which does not link libpthread may not
dlopen() a shared object which does link libpthread.
