Portability problems fixed by Gnulib:
@itemize
+@item
+This function cannot be called from plain inline or extern inline
+functions on some platforms:
+OS X 10.8.
@end itemize
Portability problems not fixed by Gnulib:
@itemize
@item
This function is missing on some platforms:
-Minix 3.1.8, mingw.
+Minix 3.1.8, mingw, MSVC 9.
@item
On some platforms, this function does not set @code{errno} or the
stream error indicator on attempts to write to a read-only stream: