^
conftest.xml:6: element book: validity error : No declaration for attribute id of element book
<book id="test">
               ^
conftest-book.xml:2: parser error : Entity 'ldquo' not defined
  <title>A DocBook &ldquo;Test Document&rdquo;</title>
                          ^
conftest-book.xml:2: parser error : Entity 'rdquo' not defined
  <title>A DocBook &ldquo;Test Document&rdquo;</title>
                                              ^
conftest-book.xml:11: parser error : chunk is not well balanced

^
conftest.xml:7: parser error : Failure to process entity conftest-book
&conftest-book;
               ^
conftest.xml:7: parser error : Entity 'conftest-book' not defined
&conftest-book;
               ^
checking for DocBook DTD... failed
configure: WARNING: cannot find a DTD for DocBook XML V4.5, you will not be able to validate your documentation
configure: WARNING: check your XML_CATALOG_FILES environment variable and/or /etc/xml/catalog
checking for xsltproc... no
configure: WARNING: cannot find xsltproc in your PATH, you will not be able to build the HTML documentation
checking for dblatex... no
configure: WARNING: cannot find dblatex in your PATH, you will not be able to build the PDF and PS documentation
checking for ghc-pkg matching /usr/local/bin/ghc... /usr/local/bin/ghc-pkg
checking for happy... /usr/local/bin/happy
checking for version of happy... 1.18.10
configure: error: Happy version 1.19.4 or later is required to compile GHC.