\def\Item#1{\Tr[ref=l]{%
 \psframebox[linestyle=none]{#1}}}
\def\psedge{\ncangle}
\psset{xbbd=1.5cm,treemode=R,
  angleB=-180,angleA=0,levelsep=72pt}
\pstree{\Item{langs}}{%
  \Item{german}
  \pstree{\Item{greek}}{%
    \Item{hamilton-kelly}
    \pstree{\Item{levy}}{%
      \Item{doc}
      \Item{src}
       }
    }
  \Item{italian}
  \pstree{\Item{portuguese}}{
    \Item{hyphenation}
   }
  \pstree{\Item{turkish}}{%
    \Item{doc}
    \Item{hyphen}
    \Item{inputs}
    \Item{mf}
    \Item{misc}
   }
\Item{xettex}
}