gentoo-overlay/app-emacs/auctex/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
<maintainer>
  <email>gnu-emacs@gentoo.org</email>
  <name>Gentoo GNU Emacs project</name>
</maintainer>
<herd>tex</herd>
<longdescription>
  AUCTeX is an extensible package for writing and formatting TeX files
  in GNU Emacs and XEmacs. It supports many different TeX macro packages,
  including AMS-TeX, LaTeX, Texinfo, ConTeXt, and docTeX (dtx files).

  AUCTeX includes preview-latex which makes LaTeX a tightly integrated
  component of your editing workflow by visualizing selected source chunks
  (such as single formulas or graphics) directly as images in the source
  buffer.
</longdescription>
<use>
  <flag name='preview-latex'>Use bundled preview-latex</flag>
</use>
</pkgmetadata>