I add the "include" and "src" folders to internal includes using the Package organizer.
Here is an example of how my package folder looks like:
I include a header file like this: #include "core/core.h"
"core/core.h" file contains this include: #include "include/core/Type.h"
If i try to build it i get an error that "include/core/Type.h" file is not found.
But TheIDE don't show any errors (red triangle) for "include/core/Type.h" if open "core/core.h" file
all the other header files contain includes like "include/folder/file.h" or "src/folder/file.h"