Undefined reference while compiling library

Question

So I have this project where I use my school library, and I can't compile a program with it. It works fine on my mac, but on Linux does not work.

I did a small main file to test the problem:

#include "includes/libft/libft.h"

int main(void)
{
    ft_printf("hello world\n");
}

Here's the command that I use to compile it:

gcc includes/libft/libft.a main.o -o test

Here's the error:

/usr/bin/ld: main.o: in function `main':
main.c:(.text+0x18): undefined reference to `ft_printf'
collect2: error: ld returned 1 exit status

And yes the library is compiled.