etc/doxygen.config missing in authentication module

can't generate documentation for authentication module, as the the
doxygen config file is missing. STEPS TO REPRODUCE: $ make doc
doxygen ./etc/doxygen.config Error: configuration file
./etc/doxygen.config not found! Doxygen version 1.3.8 Copyright
Dimitri van Heesch 1997-2004 You can use doxygen in a number of
ways: 1) Use doxygen to generate a template configuration file:
doxygen [-s] -g [configName] If - is used for configName
doxygen will write to standard output. 2) Use doxygen to update an
old configuration file: doxygen [-s] -u [configName] 3) Use
doxygen to generate documentation using an existing configuration
file: doxygen [configName] If - is used for configName
doxygen will read from standard input. 4) Use doxygen to generate a
template style sheet file for RTF, HTML or Latex. RTF: doxygen
-w rtf styleSheetFile HTML: doxygen -w html headerFile
footerFile styleSheetFile [configFile] LaTeX: doxygen -w latex
headerFile styleSheetFile [configFile] 5) Use doxygen to generate
an rtf extensions file RTF: doxygen -e rtf extensionsFile If
-s is specified the comments in the config file will be omitted. If
configName is omitted `Doxyfile' will be used as a default. make:
*** [doc] Error 1