OS X build fixes

rts/sm/Sanity.c

@@ -918,20 +918,20 @@ memInventory (rtsBool show)
           debugBelch("Memory inventory:\n");
       }
       for (g = 0; g < RtsFlags.GcFlags.generations; g++) {
-	  debugBelch("  gen %d blocks : %5" FMT_SizeT " blocks (%" FMT_SizeT " MB)\n", g, 
+	  debugBelch("  gen %d blocks : %5" FMT_Word " blocks (%" FMT_SizeT " MB)\n", g, 
                      gen_blocks[g], MB(gen_blocks[g]));
       }
-      debugBelch("  nursery      : %5" FMT_SizeT " blocks (%" FMT_SizeT " MB)\n", 
+      debugBelch("  nursery      : %5" FMT_Word " blocks (%" FMT_SizeT " MB)\n", 
                  nursery_blocks, MB(nursery_blocks));
-      debugBelch("  retainer     : %5" FMT_SizeT " blocks (%" FMT_SizeT " MB)\n", 
+      debugBelch("  retainer     : %5" FMT_Word " blocks (%" FMT_SizeT " MB)\n", 
                  retainer_blocks, MB(retainer_blocks));
-      debugBelch("  arena blocks : %5" FMT_SizeT " blocks (%" FMT_SizeT " MB)\n", 
+      debugBelch("  arena blocks : %5" FMT_Word " blocks (%" FMT_SizeT " MB)\n", 
                  arena_blocks, MB(arena_blocks));
-      debugBelch("  exec         : %5" FMT_SizeT " blocks (%" FMT_SizeT " MB)\n", 
+      debugBelch("  exec         : %5" FMT_Word " blocks (%" FMT_SizeT " MB)\n", 
                  exec_blocks, MB(exec_blocks));
-      debugBelch("  free         : %5" FMT_SizeT " blocks (%" FMT_SizeT " MB)\n", 
+      debugBelch("  free         : %5" FMT_Word " blocks (%" FMT_SizeT " MB)\n", 
                  free_blocks, MB(free_blocks));
-      debugBelch("  total        : %5" FMT_SizeT " blocks (%" FMT_SizeT " MB)\n",
+      debugBelch("  total        : %5" FMT_Word " blocks (%" FMT_SizeT " MB)\n",
                  live_blocks + free_blocks, MB(live_blocks+free_blocks));
       if (leak) {
           debugBelch("\n  in system    : %5" FMT_Word " blocks (%" FMT_Word " MB)\n",