Yes, it isn't available on Linux Mint 13, or for that matter on Ubuntu 12.04 on which it is based: http://packages.ubuntu.com/search?keywo ... ection=all
. As you can see it is available for Ubuntu 12.10 and 13.04, so Linux Mint 14 and 15. Only libmemcached6 is available for your release, which indeed has version 0.4.4.
botokiller wrote:Why aren't we keeping up?
Because this isn't a rolling release distro. You only get upgrades to packages to fix security issues, not for new features. You may try downloading the .deb file from the above link from quantal, for your architecture, and double-click that in your file manager to install it. Perhaps it will work, or it may have unsatisfiable dependencies because it needs newer versions of other libraries than are available on precise.