Case

$ cd /usr/ports/security/clamav
$ make showconfig
make install ===> The following configuration options are available for clamav-0.95.1:
     ARC=on "Enable arch archives support"
     ARJ=on "Enable arj archives support"
     LHA=on "Enable lha archives support"
     UNZOO=on "Enable zoo archives support"
     UNRAR=on "Enable rar archives support"
     MILTER=off "Compile the milter interface"
     LDAP=off "libmilter was built with LDAP"
     ICONV=off "Enable ICONV support"
     STDERR=off "Print logs to stderr instead of stdout"
     EXPERIMENTAL=off "Build experimental code"
===> Use 'make config' to modify these settings
$ make install clean