making docs for ghc6.6

When I do `make html' in ghc6.6, haddock complains about an unrecognized option `source-modules'. It appears this option was added in the most recent haddock 0.8; perhaps ghc6.6 should check the version of haddock installed? I went ahead and installed haddock 0.8, and now the documentation gets made, but `make install-docs' only installs the library documentation, not the users guide. Am I doing something wrong? Mike