Does this mean that a bug needs to be filed and d/rules to be adjusted for every package that uses readdir()? That's a pretty massive MBF and I don't think it would scale very well :)Yes, correct.
Actually, most packages already enable LFS by default (e.g by checking and using the _FILE_OFFSET_BITS=64 possibility, or by using future=+lfs), so there are not so many packages left.... Helge