gentoo-overlay/app-text/dvipng/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
<herd>tex</herd>
<herd>emacs</herd>
<longdescription>
  This program makes PNG and/or GIF graphics from DVI files as obtained
  from TeX and its relatives.

  If GIF support is enabled, GIF output is chosen by using the ‘dvigif’
  binary or with the ‘--gif’ option.

  It is intended to produce anti-aliased screen-resolution images as fast
  as is possible. The target audience is people who need to generate and
  regenerate many images again and again. The primary target is the
  preview-latex (X)Emacs package, a package to preview formulas from within
  (X)Emacs. Yes, you get to see your formulas in the (X)Emacs buffer, see
  &lt;http://www.gnu.org/software/auctex/preview-latex.html&gt;.
</longdescription>
<use>
  <flag name='t1lib'>Enable support for T1lib font rendering
    (<pkg>media-libs/t1lib</pkg>)</flag>
</use>
</pkgmetadata>