Provided in PR 20662 by David Ferlier, modified to use pkgsrc libtool
and to add users by myself.
Clam AntiVirus is an anti-virus toolkit written from scratch. It is
licensed under GNU GPL2 and uses the virus database from
OpenAntiVirus, which is an another free anti-virus project. In
contrast to OpenAntiVirus (which is written in Java), Clam AntiVirus
is written entirely in C and its database is KEPT UP TO DATE. It also
detects polymorphic viruses as well.
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