gentoo-overlay/sci-geosciences/grass/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
  <herd>sci-geosciences</herd>
  <longdescription>The original GIS, yes the first one, developed by the US Army Corp of Engineers, now an active open source GIS. 
See the GRASS Documentation Project for more info http://grass.itc.it/gdp/index.php
</longdescription>
  <use>
    <flag name="gmath">Enable gmath wrapper for BLAS/Lapack (<pkg>virtual/blas</pkg>, <pkg>virtual/lapack</pkg>)</flag>
  </use>
</pkgmetadata>