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-rw-r--r--lib/fwdlib.hpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/fwdlib.hpp b/lib/fwdlib.hpp
index 034c91a..3efac61 100644
--- a/lib/fwdlib.hpp
+++ b/lib/fwdlib.hpp
@@ -4,6 +4,7 @@
#include <string>
#include <optional>
#include <iostream>
+#include <functional>
#include <unordered_map>
#include <unordered_set>