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This chapter describes which header files contained in GNU libc but not specified by ISO C or POSIX are substituted by Gnulib, which portability pitfalls are fixed by Gnulib, and which (known) portability problems are not worked around by Gnulib.
The notation “Gnulib module: —” means that Gnulib does not provide a
module providing a substitute for the header file. When the list
“Portability problems not fixed by Gnulib” is empty, such a module is
not needed: No portability problems are known. Otherwise, it indicates
that such a module would be useful but is not available: No one so far
found this header file important enough to contribute a substitute for it.
If you need this particular header file, you may write to
<bug-gnulib at gnu dot org>.