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https://bugs.gentoo.org/768339 --- a/src/mongo/db/exec/plan_stats.h +++ b/src/mongo/db/exec/plan_stats.h @@ -33,6 +33,7 @@ #include <cstdlib> #include <string> #include <vector> +#include <optional> #include "mongo/db/index/multikey_paths.h"