packages: ptolemy-core/ptolemy-core.cabal,
          ptolemy-reader-markdown/ptolemy-reader-markdown.cabal,
          ptolemy-reader-slackdown/ptolemy-reader-slackdown.cabal,
          ptolemy-writer-html/ptolemy-writer-html.cabal,
          ptolemy-bridge/ptolemy-bridge.cabal
          ptolemy/ptolemy.cabal