gcc -pthread  -Wall -Wextra -Werror=implicit-function-declaration endian/htobe64.c -o endian/htobe64 -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lrt -lxnet -lsocket -latomic
endian/htobe64.c:3:10: fatal error: endian.h: No such file or directory
    3 | #include <endian.h>
      |          ^~~~~~~~~~
compilation terminated.