diff -r 31a43d94cc26 -r 851de24ecb61 src/MemoryMap.cpp
--- a/src/MemoryMap.cpp	Sun Sep 20 15:14:12 2009 -0700
+++ b/src/MemoryMap.cpp	Sun Sep 20 21:25:47 2009 -0700
@@ -22,13 +22,13 @@
     }
 
     void MemoryMap::mapRegion (off_t pos, size_t length) {
-        size_t end = pos+length;
+        off_t end = pos+length;
         for (int i=0; i<_nRegions; i++) {
             Region *region = _regions[i];
             if (region->position() <= pos) {
                 if (end <= region->end())
                     return;     // found an existing region covering this range
-                else if (region->setLength(end - region->position()))
+                else if (region->setLength((size_t)(end - region->position())))
                     return;     // able to grow the existing region
             }
         }