missing plugin headers

[Jack Howarth]

  On darwin, we are missing a required header file
in the /sw/lib/gcc4.5/lib/gcc/x86_64-apple-darwin10.3.0/4.5.0/plugin/include/config
installation directory. The file gcc/config/darwin-sections.def needs
to be installed in plugin/include/config. What is the 'correct' way
to achieve this (short of resorting to appending it to tm_file in
gcc/config.gcc)? Thanks in advance for any advice.
              Jack