http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49576
--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-06-29 18:26:01 UTC --- My company installs libraries under /foo/third-party and /foo/releases, those files don't change, why should they be excluded because they're not under /usr/include? If you want a new feature you need to clearly explain the semantics you want. Noone's going to take time to specify and implement a vague enhancement request without clear semantics.