cc -O2 -pipe  -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations endian/uint64_t.c -o endian/uint64_t -D_POSIX_C_SOURCE=202405L  -lm -lpthread 
endian/uint64_t.c:2:1: error: unknown type name 'uint64_t'
uint64_t* foo;
^
1 error generated.