I downloaded FLTK (Fast Light Toolkit) and I'm having trouble using the header files in it. Normally I store all of my C++ files and header files in a separate folder located in my User folder. However, when I extracted the FLTK folder(which holds the files) into this folder, and tried to compile a program that includes some of the header files, it was unable to locate them. Is there a place I should put the FLTK folder so the compiler will be able to access it, or a way to specify a file path to look for header files?