Stub out pivot_root() and unpivot_root() for all but the sudoers module.

plugins/sudoers/stubs.c

@@ -96,6 +96,20 @@ init_eventlog_config(void)
     return;
 }
 
+/* STUB */
+bool
+pivot_root(const char *new_root, int fds[2])
+{
+    return true;
+}
+
+/* STUB */
+bool
+unpivot_root(int fds[2])
+{
+    return true;
+}
+
 /*
  * Look up the hostname and set user_host and user_shost.
  */