This fixes a number of things that are warnings in the Mac compiler....

import/cross/tar_processor.cc

Index: import/cross/tar_processor.cc
===================================================================
--- import/cross/tar_processor.cc	(revision 21208)
+++ import/cross/tar_processor.cc	(working copy)
@@ -62,9 +62,9 @@
       if (header_bytes_read_ == TAR_HEADER_SIZE) {
         const char *filename = (const char *)header_;
 
-        // The tar format stupidly represents size_teger values as
+        // The tar format stupidly represents size_t integer values as
         // octal strings!!
-        size_t file_size = 0;
+        unsigned int file_size = 0u;
         sscanf(header_ + 124, "%o", &file_size);
 
         // Only callback client if this is a "real" header