fontconfig-dev.tcz
   fontconfig.tcz
      expat2.tcz
      freetype.tcz
         libpng.tcz
   expat2-dev.tcz
      expat2.tcz
   freetype-dev.tcz
      freetype.tcz
         libpng.tcz
      libpng-dev.tcz
         libpng-bin.tcz
            libpng.tcz