@itemize
@item
This function is missing on some old platforms.
-
+@item
+This function does not support the error values that are specified by POSIX
+but not defined by the system, on some platforms:
+OpenBSD 4.0, OSF/1 5.1, mingw.
@item
This function fails to return a string for out-of-range integers on
some platforms:
-Solaris 8
+Solaris 8.
@end itemize
Portability problems not fixed by Gnulib: