libapache2-mod-authz-unixgroup - 1.1.0-0.1+b1 main

Mod_Authz_Unixgroup is a unix group access control module for Apache 2.1 and
later. If you are having users authenticate with real Unix login ID over the
net, using something like my mod_authnz_external / pwauth combination, and
you want to do access control based on unix group membership, then
mod_authz_unixgroup is exactly what you need.
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This Package includes the mod-authn-unixgroup Module for Apache Version 2.4