linux x86-64 NASM assembly [HELP!]

When I link against libc (using ld file.o -lc), a.out doesn't work. I can't execute it with ./a.out (no such file or directory), bash a.out (cannot execute binary file), and trying ldd a.out gives me «no such file or directory» too.
What am I doing wrong? inb4 “using assembly”