@section @code{atan}
@findex atan
-POSIX specification: @url{http://www.opengroup.org/susv3xsh/atan.html}
+POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/atan.html}
-Gnulib module: ---
+Gnulib module: atan
Portability problems fixed by Gnulib:
@itemize