current VCS problem with doxygen

With a current checkout, I am getting a build failure in the doxygen phase

CFLAGS="-g0 -O2 -pipe " \
CPPFLAGS="-I/usr/include/c++/4.1.1/x86_64-redhat-linux/ " \
                 ./configure \
   ... \
                 --enable-doxygen \
   ...

ends:

  ...
llvm[1]: Installing HTML documentation
llvm[1]: Building doxygen documentation
Error: configuration file /home/herrold/rpmbuild/BUILD/clang-20100603/docs/doxygen.cfg not found!
Doxygen version 1.4.7
Copyright Dimitri van Heesch 1997-2006
  ...