First you need to make sure you have SVN package installed in your system. The easiest way to do this is to type "svn" in the shell console. In case it isn't, you need to install package called "subversion" to the system. Few examples:

In debian, type apt-get install subversion

In gentoo, type emerge subversion or

For other distributions you need to check the documentation on how to install packages. After this you can fetch the fresh sources from the proper site by using following commands:

MVDSV:

KTX:

QTV:

Updated information for Git (since KTX and MVDSV moved to Git repositories)

In debian, type apt-get install git
In gentoo, type emerge git

MVDSV:

KTX: