diff --git a/update_engine.gyp b/update_engine.gyp
index 8dd5d2d..e8db1ed 100644
--- a/update_engine.gyp
+++ b/update_engine.gyp
@@ -273,6 +273,9 @@
             '<@(exported_deps)',
           ],
         },
+        'libraries': [
+          '-lvboot_host',
+        ],
       },
       'sources': [
         'payload_generator/cycle_breaker.cc',
@@ -288,6 +291,7 @@
         'payload_generator/payload_signer.cc',
         'payload_generator/tarjan.cc',
         'payload_generator/topological_sort.cc',
+        'payload_generator/verity_utils.cc',
       ],
     },
     # server-side delta generator.
@@ -381,6 +385,7 @@
             'payload_generator/payload_signer_unittest.cc',
             'payload_generator/tarjan_unittest.cc',
             'payload_generator/topological_sort_unittest.cc',
+            'payload_generator/verity_utils_unittest.cc',
             'payload_state_unittest.cc',
             'postinstall_runner_action_unittest.cc',
             'prefs_unittest.cc',