freebsd-ports/lang/pocl/pkg-message

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Deadlocks (freezes) on FreeBSD:
OpenCL applications using pocl on FreeBSD must be compiled with
options CFLAGS+=-pthread or CXXFLAGS+=-pthread, otherwise someone risk
that a library may not initialize the threading on BSD independently,
even if an ICD loader is used.
See:
http://www.freebsd.org/cgi/query-pr.cgi?pr=163512
(Source: http://portablecl.org/docs/html/faq.html?highlight=freebsd)