Tiziano Müller wrote:
> # Tiziano Müller <dev-zero@g.o> (07 Jun 2008)
> # Various bugs and dead upstream
> #   herdstat: 164254, 184035, 222887
> #   libherdstat: 119589, 206876
> # Masked for removal in 30 days
> app-portage/herdstat
> dev-cpp/libherdstat
>
> Sorry people, but we (Halcy0n and I) really don't have the time nor the will
> to maintain this package (dev-cpp/libherdstat) anymore without an upstream.
>
>   
glimpse can be used to search stuff in all metadata.xml files.

All you have to do is:
  mkdir  metasearch
  echo '*' > metasearch/.glimpse_exclude
  echo metadata.xml > metasearch/.glimpse_include
  glimpseindex -i -B -H metasearch <portage-dir>
  glimpse -H metasearch <regex>