1 files changed, 8 insertions, 2 deletions
diff --git a/sigchainlib/sigchain_dummy.cc b/sigchainlib/sigchain_dummy.cc
index 7176f052cb..17bfe8f729 100644
--- a/sigchainlib/sigchain_dummy.cc
+++ b/sigchainlib/sigchain_dummy.cc
@@ -14,6 +14,9 @@
  * limitations under the License.
  */
 
+#include <stdio.h>
+#include <stdlib.h>
+
 #ifdef HAVE_ANDROID_OS
 #include <android/log.h>
 #else
@@ -21,8 +24,6 @@
 #include <iostream>
 #endif
 
-#include <stdlib.h>
-
 #include "sigchain.h"
 
 static void log(const char* format, ...) {
@@ -57,3 +58,8 @@ extern "C" void InitializeSignalChain() {
   log("InitializeSignalChain is not exported by the main executable.");
   abort();
 }
+
+extern "C" void EnsureFrontOfChain(int signal, struct sigaction* expected_action) {
+  log("EnsureFrontOfChain is not exported by the main executable.");
+  abort();
+}