ipv6calc is a small utility written in programming language C to manipulate (not only) IPv6 addresses. Intentions were convering a given IPv6 address into compressed format, convering a given IPv6 address into the same format like shown in /proc/net/if_inet6 and (because it was not difficulty) migrating the Perl program ip6_int into. Now only one utiltity is needed to do a lot. This utility was also used in the past to extend features on network-functions-ipv6 library, used by initscripts-ipv6. To enable IP2Location support you will need to install C-IP2location first, and then pass: IP2LOCATION=yes to this Slackbuild.