Larger project management in C.

Are there any books or websites that detail good technique to use when making larger projects in C? Specifically layout of files, functions etc.

Most of my projects are little tools and when I come across larger projects with complicated makefiles and directories full of source files I often don't know where to start.

Hmm, the only good book on large scale design that I know of focuses on C++, but the lessons are useful for C as well. You might find Code Reading by Diomidis Spinellis handy as well, though how to design for large programs isn't really the intent of that book.

Thanks, I'll take a look.