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diff -purN orig/boost/detail/atomic_count.hpp boost_1_36_0/boost/detail/atomic_count.hpp
--- orig/boost/detail/atomic_count.hpp 2008-09-12 11:48:45.000000000 -0400
+++ boost_1_36_0/boost/detail/atomic_count.hpp 2008-09-12 14:36:33.000000000 -0400
@@ -93,6 +93,13 @@ typedef long atomic_count;
# include <boost/detail/atomic_count_pthreads.hpp>
+#elif defined(BOOST_HAS_PTHREADS) && defined(__arm__) && !defined(__ARM_ARCH_7A__) && !defined(__ARM_ARCH_6J__)
+
+// MLC: need this on ARM, otherwise it'll attempt to use atomic_count_sync,
+// which has no ARM implementation.
+# define BOOST_AC_USE_PTHREADS
+# include <boost/detail/atomic_count_pthreads.hpp>
+
#elif defined( __GNUC__ ) && ( defined( __i386__ ) || defined( __x86_64__ ) )
# include <boost/detail/atomic_count_gcc_x86.hpp>
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