6.6.7 Additional Search Paths and Directories
For the compiler, assembler and linker, you may set additional paths to directories to be searched for include files and libraries.
You may add as many directories as necessary to include a variety of paths. The current working directory is always searched first and then the additional directories in the order in which they were specified.
All paths specified should be relative to the project directory, which
is the directory containing the nbproject
directory.