diff --git a/.circleci/config.yml b/.circleci/config.yml
index 51fcf2bae..4c2d361d1 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -138,7 +138,7 @@ jobs:
       - install-cmake-on-macos
       - install-gflags-on-macos
       - pre-steps-macos
-      - run: ulimit -S -n 1048576 && (mkdir build && cd build && cmake -DWITH_GFLAGS=0 .. && make V=1 -j32) | .circleci/cat_ignore_eagain
+      - run: ulimit -S -n 1048576 && (mkdir build && cd build && cmake -DWITH_GFLAGS=1 .. && make V=1 -j32) | .circleci/cat_ignore_eagain
       - post-steps
 
   build-linux:
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3b34e5e2b..8f67a1a36 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1342,6 +1342,7 @@ endif()
 
 if(WITH_BENCHMARK_TOOLS)
   add_executable(db_bench${ARTIFACT_SUFFIX}
+    tools/simulated_hybrid_file_system.cc
     tools/db_bench.cc
     tools/db_bench_tool.cc)
   target_link_libraries(db_bench${ARTIFACT_SUFFIX}