`CompareModifiedEntry`, as used in

https://github.com/bitcoin/bitcoin/blob/3c098a8aa0780009c11b66b1a5d488a928629ebf/src/miner.h#L97-L112

will trigger a compile-time error in many `const` operations of index #1 of `indexed_modified_transaction_set` because `CompareModifiedEntry::operator()` is not `const`.

Most likely related to:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224129
#ifndef BITCOIN_MINER_H
#define BITCOIN_MINER_H
#include <primitives/block.h>
#include <txmempool.h>
#include <stdint.h>
#include <memory>
#include <boost/multi_index_container.hpp>
#include <boost/multi_index/ordered_index.hpp>
class CBlockIndex;
class CChainParams;