https://bugs.gentoo.org/888605
--- a/src/bench/block_assemble.cpp
+++ b/src/bench/block_assemble.cpp
@@ -22,6 +22,7 @@
 
 #include <list>
 #include <vector>
+#include <array>
 
 static std::shared_ptr<CBlock> PrepareBlock(const CScript& coinbase_scriptPubKey)
 {
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -29,6 +29,7 @@
 #include <util/system.h>
 #include <util/moneystr.h>
 #include <util/strencodings.h>
+#include <array>
 
 #include <memory>