diff --git a/build_tests/gflags.cc b/build_tests/gflags.cc
new file mode 100644
index 0000000..150e330
--- /dev/null
+++ b/build_tests/gflags.cc
@@ -0,0 +1,7 @@
+#include "third_party/gflags/include/gflags/gflags.h"
+
+DEFINE_int32(test_flag, 0, "Test command-line flag");
+
+int main() {
+  return FLAGS_test_flag;
+}