// to compile, using an absolute link: 

// gm -c -isystem /home/frank/src/annotations/yo/modules/examples/locallib/hdrs main.cc

// the absolute location may contain links to the actual locations of the .h
// and .h.gcm files

// there must be a link in gcm.cache to the initial part(s) of the
// desitnation, e.g., gcm.cache/home -> /home
// if a shortcut link is defined, e.g., in /home/frank:
//    ln -s /home/frank/src/annotations/yo/modules/examples/mylib/hdrs libhdrs
// then 
//    gm -c -isystem /home/frank/libhdrs main.cc 
// also works

import "base.h";
import "middle.h";
import "top.h";

int main()
{
    Base base;
    Middle middle;
    Top top;
}