When I try to compiler jost (a JSON parser) I get a ton of errors, the first being jost/Array.hpp: No such file or directory.

I've imported all of the jost files into my project. They are located in Project\jost

I'm looking at the file that it says that can't be found. Why is this? Dev-C++, GNU C++ compiler. I shouldn't have to add anything to the linker because it's all source code, no library.