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-rw-r--r--src/stl_logging_unittest.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/stl_logging_unittest.cc b/src/stl_logging_unittest.cc
index 63e28a1..89fd6a1 100644
--- a/src/stl_logging_unittest.cc
+++ b/src/stl_logging_unittest.cc
@@ -31,6 +31,7 @@
#ifdef HAVE_USING_OPERATOR
+#include <functional>
#include <iostream>
#include <map>
#include <ostream>