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AC_DEFUN([rk_LIBDISPATCH],[
AC_CHECK_HEADERS([dispatch/dispatch.h])
AC_FIND_FUNC_NO_LIBS(dispatch_async_f, dispatch,
[#ifdef HAVE_DISPATCH_DISPATCH_H
#include <dispatch/dispatch.h>
#endif],[0,0,0])
if test "$ac_cv_func_dispatch_async_f" = yes ; then
AC_DEFINE([HAVE_GCD], 1, [Define if os support gcd.])
libdispatch=yes
else
libdispatch=no
fi
AM_CONDITIONAL(have_gcd, test "$libdispatch" = yes)
])
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