Comment 5 for bug 1310866

It's not "missing", it no longer exists in glibc 2.19. What problem is this actually causing? Reading the old bits/predefs.h, it throws this error:

# error "Never use <bits/predefs.h> directly; include <stdc-predef.h> instead."

The new stdc-predef.h now completely replaces it. So, given that you should never have been including it directly in the first place, I'm at a loss as to how anything's changed. :P