The declaration of @code{fseeko} in @code{<stdio.h>} is not enabled by default
on some platforms: glibc 2.3.6.
@item
-This function fails on seekable stdin, stdout, and stderr: cygwin 1.5.x.
+This function fails on seekable stdin, stdout, and stderr: cygwin <= 1.5.24.
@end itemize
Portability problems not fixed by Gnulib: