g++ ./src/main.cpp -std=c++17 -DNDEBUG -O3 -march=native -pthread -o 4ku-8D26D3D0
./src/main.cpp:164:63: warning: use of ‘auto’ in parameter declaration only available with ‘-std=c++20’ or ‘-fconcepts’
  164 | [[nodiscard]] u64 ray(const i32 sq, const u64 blockers, const auto f) {
      |                                                               ^~~~
./src/main.cpp:373:33: warning: use of ‘auto’ in parameter declaration only available with ‘-std=c++20’ or ‘-fconcepts’
  373 |                           const auto f) {
      |                                 ^~~~
./src/main.cpp: In function ‘i32 main(i32, const char**)’:
./src/main.cpp:1259:24: error: ‘jthread’ was not declared in this scope; did you mean ‘pthread_t’?
 1259 |                 vector<jthread> threads;
      |                        ^~~~~~~
      |                        pthread_t
./src/main.cpp:1259:31: error: template argument 1 is invalid
 1259 |                 vector<jthread> threads;
      |                               ^
./src/main.cpp:1259:31: error: template argument 2 is invalid
./src/main.cpp:1262:29: error: request for member ‘emplace_back’ in ‘threads’, which is of non-class type ‘int’
 1262 |                     threads.emplace_back([=, &stop]() mutable {
      |                             ^~~~~~~~~~~~
make: *** [Makefile:12: all] Error 1