diff -dur osm2pgsql/build_geometry.cpp osm2pgsql/build_geometry.cpp
--- osm2pgsql/build_geometry.cpp	2010-04-07 19:51:14.000000000 -0600
+++ osm2pgsql/build_geometry.cpp	2012-10-10 16:49:14.839696941 -0600
@@ -64,7 +64,8 @@
 
 char *get_wkt_simple(osmNode *nodes, int count, int polygon) {
     GeometryFactory gf;
-    std::auto_ptr<CoordinateSequence> coords(gf.getCoordinateSequenceFactory()->create(0, 2));
+    std::auto_ptr<CoordinateSequence> coords(gf.getCoordinateSequenceFactory()->create(
+    	static_cast<std::size_t>(0), static_cast<std::size_t>(2)));
 
     try
     {
@@ -106,7 +107,8 @@
 
 size_t get_wkt_split(osmNode *nodes, int count, int polygon, double split_at) {
     GeometryFactory gf;
-    std::auto_ptr<CoordinateSequence> coords(gf.getCoordinateSequenceFactory()->create(0, 2));
+    std::auto_ptr<CoordinateSequence> coords(gf.getCoordinateSequenceFactory()->create(
+    	static_cast<std::size_t>(0), static_cast<std::size_t>(2)));
     double area;
     WKTWriter wktw;
     size_t wkt_size = 0;
@@ -136,7 +138,8 @@
 
             double distance = 0;
             std::auto_ptr<CoordinateSequence> segment;
-            segment = std::auto_ptr<CoordinateSequence>(gf.getCoordinateSequenceFactory()->create(0, 2));
+            segment = std::auto_ptr<CoordinateSequence>(gf.getCoordinateSequenceFactory()->create(
+    				static_cast<std::size_t>(0), static_cast<std::size_t>(2)));
             segment->add(coords->getAt(0));
             for(unsigned i=1; i<coords->getSize(); i++) {
                 segment->add(coords->getAt(i));
@@ -148,7 +151,8 @@
                     areas.push_back(0);
                     wkt_size++;
                     distance=0;
-                    segment = std::auto_ptr<CoordinateSequence>(gf.getCoordinateSequenceFactory()->create(0, 2));
+                    segment = std::auto_ptr<CoordinateSequence>(gf.getCoordinateSequenceFactory()->create(
+    				static_cast<std::size_t>(0), static_cast<std::size_t>(2)));
                     segment->add(coords->getAt(i));
                 }
             }
@@ -246,7 +250,7 @@
             case GEOS_MULTIPOINT:
                 // Drop through
             case GEOS_MULTILINESTRING:
-                gc = (GeometryCollection *) geometry;
+                gc = dynamic_cast<GeometryCollection *>(geometry);
                 num_geometries = gc->getNumGeometries();
                 *xnodes = (struct osmNode **) malloc((num_geometries + 1) * sizeof(struct osmNode *));
                 *xcount = (int *) malloc(num_geometries * sizeof(int));
@@ -299,7 +303,8 @@
     try
     {
         for (int c=0; xnodes[c]; c++) {
-            std::auto_ptr<CoordinateSequence> coords(gf.getCoordinateSequenceFactory()->create(0, 2));
+            std::auto_ptr<CoordinateSequence> coords(gf.getCoordinateSequenceFactory()->create(
+ 	   	static_cast<std::size_t>(0), static_cast<std::size_t>(2)));
             for (int i = 0; i < xcount[c]; i++) {
                 struct osmNode *nodes = xnodes[c];
                 Coordinate c;
@@ -348,7 +353,8 @@
                         //std::cerr << "polygon(" << osm_id << ") is no good: points(" << pline->getNumPoints() << "), closed(" << pline->isClosed() << "). " << writer.write(pline.get()) << std::endl;
                 double distance = 0;
                 std::auto_ptr<CoordinateSequence> segment;
-                segment = std::auto_ptr<CoordinateSequence>(gf.getCoordinateSequenceFactory()->create(0, 2));
+                segment = std::auto_ptr<CoordinateSequence>(gf.getCoordinateSequenceFactory()->create(
+    			static_cast<std::size_t>(0), static_cast<std::size_t>(2)));
                 segment->add(pline->getCoordinateN(0));
                 for(unsigned i=1; i<pline->getNumPoints(); i++) {
                     segment->add(pline->getCoordinateN(i));
@@ -360,7 +366,8 @@
                         areas.push_back(0);
                         wkt_size++;
                         distance=0;
-                        segment = std::auto_ptr<CoordinateSequence>(gf.getCoordinateSequenceFactory()->create(0, 2));
+                        segment = std::auto_ptr<CoordinateSequence>(gf.getCoordinateSequenceFactory()->create(
+    				static_cast<std::size_t>(0), static_cast<std::size_t>(2)));
                         segment->add(pline->getCoordinateN(i));
                     }
                 }
@@ -462,7 +469,7 @@
             {
                 for(unsigned i=0; i<toplevelpolygons; i++) 
                 {
-                    Polygon* poly = (Polygon*)polygons->at(i);
+                    Polygon* poly = dynamic_cast<Polygon*>(polygons->at(i));
                     std::string text = writer.write(poly);
                     wkts.push_back(text);
                     areas.push_back(poly->getArea());