You seem to have out of date files.

[chasingthetrade]

/mem_pool.h:54:26: error:_gnu_cxx::alloc_traits<std::allocator<Common::MemPoolTrading::MarketOrdersAtPrice::ObjectBlock>, Common::MemPoolTrading::MarketOrdersAtPrice::ObjectBlock>::value_type’ {aka ‘struct Common::MemPoolTrading::MarketOrdersAtPrice::ObjectBlock’} has no member named ‘is_free’
54 | store[elem_index].is_free.store(true, std::memory_order_release);
| ~~~~~~~~~~~~~~~~~~~^~~~~~~~