Note: You will need root privileges on your system, unless you install from source.
At the time of writing Ubuntu GNU/Linux and Gentoo GNU/Linux include Tablix package in their package managing systems. Packages should also be soon be available for Debian GNU/Linux.
Before compiling and installing Tablix from source you should check if your operating system distribution already includes Tablix packages. If it does, then the easiest way to install Tablix on your machine is to use the package manager your distribution supplies. Note however that the included Tablix package may be outdated and that you may want to install from source anyway to get the latest version of Tablix (specifically Gentoo package is terribly outdated at the time of writing). The newest Tablix releases can always be downloaded from tablix.org.
Note: Even if you can't or do not want to install Tablix from a package for your distribution you may want to consider using libxml and/or PVM3 packages and then compiling Tablix using libraries from these packages. Note however that in this case your have to install packages that include development versions of libraries (such packages usually have -dev in their names).