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Date: Thu, 25 Aug 2011 19:06:41 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Rusty Nejdl <rnejdl@ringofsaturn.com>
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	(wonkity.com [127.0.0.1]); Thu, 25 Aug 2011 19:06:42 -0600 (MDT)
Cc: freebsd-emulation@freebsd.org
Subject: Re: virtualbox on FreeBSD 8.2
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On Thu, 25 Aug 2011, Rusty Nejdl wrote:

> I was building a port that depended on threaded perl and used code like this:
>
> .if exists(${PERL})
> PERL_THREADS!=  ${PERL} -V::usethreads
> .if ${PERL_THREADS}!="'define';"
> IGNORE=         needs a threaded Perl, build with WITH_THREADS=yes flag and 
> try again
> .endif
> .else
> IGNORE=         needs an existing installation of Perl built with 
> WITH_THREADS=yes
> .endif
>
> Perhaps you could use something similar?

Some searching found security/clamav/Makefile:

.if (defined(WITH_LLVM) || defined(WITH_LLVM_PORTS)) && defined(WITH_TESTS)
pre-configure:
         @if ! ${PYTHON_CMD} -c "import thread" >/dev/null 2>&1; then \
                 ${ECHO_MSG} ""; \
                 ${ECHO_MSG} "=========================================================================
                 ${ECHO_MSG} "= Unit tests REQUIRES python built with thread support, and yours is not.
                 ${ECHO_MSG} "= It will not be called during this build
                 ${ECHO_MSG} "=========================================================================
                 ${ECHO_MSG} ""; \
                 ${TOUCH} ${PY_NO_THREAD}; \
         fi
.endif