error.txt

ld: library not found for -l./helloworld.o
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Error: execution of command failed with code: 1: `cc -o "/Users/isaac/.cache/crystal/crystal-run-helloworld.tmp" "${@}"  -rdynamic  -l./helloworld.o -lpcre -lgc -lpthread /Users/isaac/.anyenv/envs/crenv/versions/0.21.0/src/ext/libcrystal.a -levent -liconv -ldl -L/usr/lib -L/usr/local/lib`

helloworld.c

#include <stdio.h>

void hello( const char * name ) { 
    printf( "Hello, %s!\n", name );
}

helloworld.cr

#how would I got about linking to the above file?
@[Link("helloworld.o")]

lib Say 
  fun hello(name : LibC::Char*) : Void
end

puts Say.hello("isaac")