cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations endian/BYTE_ORDER.c -o endian/BYTE_ORDER -D_POSIX_C_SOURCE=202405L  -lm -lpthread  -liconv
endian/BYTE_ORDER.c:1:10: fatal error: 'endian.h' file not found
    1 | #include <endian.h>
      |          ^~~~~~~~~~
1 error generated.