sys-libs/pam/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
  <herd>pam</herd>
  <maintainer>
    <email>pam-bugs@gentoo.org</email>
  </maintainer>
  <use>
    <flag name='audit'>Enable support for <pkg>sys-process/audit</pkg></flag>

    <flag name="berkdb">
      Build the pam_userdb module, that allows to authenticate users
      against a Berkeley DB file. Please note that enabling this USE
      flag will create a PAM module that links to the Berkeley DB (as
      provided by <pkg>sys-libs/db</pkg>) installed in /usr/lib and
      will thus not work for boot-critical services authentication.
    </flag>

    <flag name="cracklib">
      Build the pam_cracklib module, that allows to verify the chosen
      passwords' strength through the use of
      <pkg>sys-libs/cracklib</pkg>. Please note that simply enabling
      the USE flag on this package will not make use of pam_cracklib
      by default, you should also enable it in
      <pkg>sys-auth/pambase</pkg> as well as update your configuration
      files.
    </flag>
  </use>
</pkgmetadata>