@section @code{log2}
@findex log2
-POSIX specification: @url{http://www.opengroup.org/susv3xsh/log2.html}
+POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/log2.html}
Gnulib module: ---
@itemize
@item
This function is missing on some platforms:
-MacOS X 10.3, FreeBSD 6.0, NetBSD 3.0, OpenBSD 3.8, AIX 5.1, IRIX 6.5, Solaris 9, Cygwin, Interix 3.5.
+MacOS X 10.3, FreeBSD 6.0, NetBSD 3.0, OpenBSD 3.8, AIX 5.1, IRIX 6.5,
+Solaris 9, Interix 3.5.
+@item
+This function is only provided as a macro on some platforms:
+Cygwin 1.5.x.
@end itemize