--- boost_svn_84915/multiprecision/cpp_int.hpp	2013-06-30 21:05:18.000000000 +1000
+++ boost_work/multiprecision/cpp_int.hpp	2013-06-30 22:03:28.000000000 +1000
@@ -1611,7 +1611,7 @@
                }
             }
          }
-         unsigned n = result.find_first_not_of('0');
+         std::string::size_type n = result.find_first_not_of('0');
          result.erase(0, n);
          if(result.empty())
             result = "0";