* libmisc/copydir.c, src/usermod.c, lib/prototypes.h: The uid and

gid parameters can be set to -1 to indicate that the original
  owners must be kept. Change the types from uid_t/gid_t to a
  long int (signed).
* libmisc/copydir.c: Change the copy_entry(), copy_dir(),
  copy_symlink(), copy_special(), and copy_file() prototypes
  accordingly.
* lib/prototypes.h: Add the parameters' name for the
  libmisc/copydir.c functions.

src/usermod.c

@@ -1328,8 +1328,8 @@ static void move_home (void)
 					fail_exit (E_HOMEDIR);
 				}
 				if (copy_tree (user_home, user_newhome,
-					       uflg ? user_newid : -1,
-					       gflg ? user_newgid : -1) == 0) {
+					       uflg ? (long int)user_newid : -1,
+					       gflg ? (long int)user_newgid : -1) == 0) {
 					if (remove_tree (user_home) != 0 ||
 					    rmdir (user_home) != 0)
 						fprintf (stderr,