gentoo-overlay/dev-lang/gdl/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
<herd>sci</herd>
<longdescription lang="en">
  A free IDL (Interactive Data Language) compatible incremental compiler
  (ie. runs IDL programs). IDL is a registered trademark of ITT Visual 
  Information Solutions.
</longdescription>
<use>
  <flag name='hdf'>Add support for the Hierarchical Data Format v.4</flag>
  <flag name='gshhs'>Add support for projection adn continent maps with <pkg>sci-geosciences/gshhs-data</pkg></flag>

  <flag name='grib'>Add support for the meteorological GRIB format with <pkg>sci-libs/grib_api</pkg></flag>
  <flag name="proj">Add support for <pkg>sci-libs/proj</pkg> (geographic projections)</flag>
  <flag name='udunits'>Add support for manipulating units of physical quantities</flag>
</use>
</pkgmetadata>