task-kde, task-kde-devel not installable

[John Dalbec]

Sorry, but the following packages have unmet dependencies:
  task-kde: Depends: pixie but it is not installable
            Depends: kformula but it is not installable
E: Sorry, broken packages                                                     
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Sorry, but the following packages have unmet dependencies:
  task-kde-devel: Depends: xlibs-dev but it is not installable or
                           xlibs6g-dev but it is not installable
                  Depends: libxml2-dev but it is not installable
E: Sorry, broken packages                                                     
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John