Portability problems not fixed by Gnulib:
@itemize
@item
-C99 and POSIX-2001 and later require end-of-file to be sticky, that
+C99 and POSIX.1-2001 and later require end-of-file to be sticky, that
is, they require this function to act as if it reads end-of-file if
@code{feof} would return nonzero. However, on some systems this
function attempts to read from the underlying file descriptor even if