@section @code{vfprintf}
@findex vfprintf
-POSIX specification: @url{http://www.opengroup.org/susv3xsh/vfprintf.html}
+POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/vfprintf.html}
Gnulib module: vfprintf-posix or stdio, sigpipe