[proaudio] Current ardour-3.999 fails to configure

[Jannis Achstetter <kripton@xxxxxxxxxxxxxx>]

Log:
Ausgecheckt, Revision 13744.
 *    working copy: /usr/portage/distfiles/svn-src/ardour/3.0

>>> Source unpacked in 
>>> /var/tmp/portage/media-sound/ardour-3.9999/work Preparing 
>>> source in
/var/tmp/portage/media-sound/ardour-3.9999/work/ardour-3.9999 ...
>>> Source prepared. Configuring source in
/var/tmp/portage/media-sound/ardour-3.9999/work/ardour-3.9999 ...
 * ./waf configure --freedesktop --noconfirm --prefix=/usr --nls --lv2
--no-freesound --doc --fpu-optimization
waf [commands] [options]

Main commands (example: ./waf build -j4)
  build    : executes the build
  clean    : cleans the project
  configure: configures the project
  dist     : makes a tarball for redistributing the sources
  distcheck: checks if the project compiles (tarball from 'dist')
  distclean: removes the build directory
  install  : installs the targets on the system
  list     : lists the targets to execute
  step     : executes tasks in a step-by-step fashion, for debugging
  uninstall: removes the targets installed
  update   : updates the plugins from the *waflib/extras* directory

waf: error: ambiguous option: --doc (--docdir, --docs?)