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__)
+
+// 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>