--- src/extract.c~before~preallocate	2006-03-29 12:03:07.000000000 -0800
+++ src/extract.c	2006-03-29 12:04:17.000000000 -0800
@@ -40,6 +40,10 @@ struct copyfile_list_entry_t {
 extern LIST_HEAD(copyfile_list_t, copyfile_list_entry_t) copyfile_list;
 #endif
 
+#ifdef __APPLE__
+#include <sys/mount.h>
+#endif /* __APPLE__ */
+
 static bool we_are_root;	/* true if our effective uid == 0 */
 static mode_t newdir_umask;	/* umask when creating new directories */
 static mode_t current_umask;	/* current umask (which is set to 0 if -p) */
@@ -731,6 +735,10 @@ extract_archive (void)
     {
       static int conttype_diagnosed;
 
+#ifdef __APPLE__
+      /* XXX Would be nice to suppress this warning if we pre-allocate. */
+#endif /* __APPLE__ */
+
       if (!conttype_diagnosed)
 	{
 	  conttype_diagnosed = 1;
@@ -785,6 +793,20 @@
 	}
     }
 
+#ifdef __APPLE__
+  /* Attempts to pre-allocate blocks for the destination file. */
+  if (!current_stat_info.is_sparse) {
+    fstore_t fst;
+
+    fst.fst_flags = 0;
+    fst.fst_posmode = F_PEOFPOSMODE;
+    fst.fst_offset = 0;
+    fst.fst_length = current_stat_info.stat.st_size;
+
+    (void)fcntl(fd, F_PREALLOCATE, &fst);
+  }
+#endif /* __APPLE__ */
+
   mv_begin (&current_stat_info);
   if (current_stat_info.is_sparse)
     sparse_extract_file (fd, &current_stat_info, &size);