@item
This function is missing on some platforms:
FreeBSD 5.2.1, OpenBSD 3.8, AIX 5.1, HP-UX 11, IRIX 6.5, OSF/1 4.0, Solaris 9, Interix 3.5.
+@item
+This functions returns a wrong result for x = 1/2 - 2^-25 on some platforms:
+mingw.
@end itemize
Portability problems not fixed by Gnulib: