Return LIB_PROTO_MUTATOR_FUZZER_LIBRARIES as it's used by OSS-fuzz
diff --git a/examples/libfuzzer/CMakeLists.txt b/examples/libfuzzer/CMakeLists.txt
index 18eaf89..dc39177 100644
--- a/examples/libfuzzer/CMakeLists.txt
+++ b/examples/libfuzzer/CMakeLists.txt
@@ -33,7 +33,8 @@
   add_executable(${fuzzer} ${fuzzer}.cc)
   target_link_libraries(${fuzzer}
                         fuzzer-example-proto
-                        protobuf-mutator-libfuzzer)
+                        protobuf-mutator-libfuzzer
+                        ${LIB_PROTO_MUTATOR_FUZZER_LIBRARIES})
   set_property(TARGET ${fuzzer}
                PROPERTY COMPILE_FLAGS ${FUZZING_FLAGS})
   set_property(TARGET ${fuzzer}