The declaration of @code{ftello} in @code{<stdio.h>} is not enabled by default
on some platforms: glibc 2.3.6.
@item
+This function produces incorrect results after @code{putc} that followed a
+@code{getc} call that reached EOF on some platforms:
+Solaris 10.
+@item
This function fails on seekable stdin, stdout, and stderr: cygwin <= 1.5.24.
@end itemize