Yes and AFAIK any fil-C program needs to be linked against fil-C compiled libraries, such as libc/musl/etc. I too would like to know what other challenges exist in making this process more automated.
What precisely do you mean by "this process"? The kind of linking that Fil-C supports is pretty different from what the blog post proposes.
What precisely do you mean by "this process"? The kind of linking that Fil-C supports is pretty different from what the blog post proposes.