What are your reasons for relinking the ACU-GT runtime?
If you're adding functionality by including C functions, is there a reason you can't create a DLL or Shared Object Library (SO) and call that instead?
If you're adding support for your own File System, is there a way we can make that easier, so that you can write your own DLL or SO instead?
Are you relinking for some other reason? What?
I am just curious.