Simple workaround for compilation under MacOS

This works around a compilation bug in Apple GCC 4.2 + Macports.

src/graph/graph_bind.cc

@@ -15,6 +15,9 @@
 // You should have received a copy of the GNU General Public License
 // along with this program. If not, see <http://www.gnu.org/licenses/>.
 
+#include <boost/python.hpp>
+#include <boost/python/suite/indexing/vector_indexing_suite.hpp>
+
 #define NUMPY_EXPORT
 #include "numpy_bind.hh"
 
@@ -22,9 +25,6 @@
 #include "graph_python_interface.hh"
 #include "graph_util.hh"
 
-#include <boost/python.hpp>
-#include <boost/python/suite/indexing/vector_indexing_suite.hpp>
-
 #ifdef HAVE_SCIPY // integration with scipy weave
 #include "weave/scxx/object.h"
 #include "weave/scxx/list.h"