?package(giac):needs="text" section="Applications/Math"\
  title="giac" command="/usr/bin/giac"
?package(giac):needs="X11" section="Applications/Math"\
  title="Xcas" command="/usr/bin/xcas"
?package(giac):needs="X11" section="Applications/Math"\
  title="Xcas/Texmacs" command="/usr/bin/xgiac"