You need to install software from the testing archive
You need to edit /etc/apt/sources.list so your distribution can find the software archives. This can be done by copying all the lines and changing stable (or etch) into testing.
The result might look like:
# deb cdrom:[Debian GNU/Linux 4.0 r4a _Etch_ - Official amd64 CD Binary-1 20080803-21:56]/ etch contrib main
deb http://ftp.de.debian.org/debian/ etch main non-free contrib
#deb http://ftp.de.debian.org/debian/ unstable main contrib non-free
deb-src http://ftp.de.debian.org/debian/ etch main
deb http://security.debian.org/ etch/updates main contrib
deb-src http://security.debian.org/ etch/updates main contrib
#from here testing (Wim)
deb http://ftp.de.debian.org/debian/ testing main non-free contrib
deb-src http://ftp.de.debian.org/debian/ testing main
deb http://security.debian.org/ testing/updates main contrib
deb-src http://security.debian.org/ testing/updates main contrib
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About the Author
Author: Wim Peeters - Keskon GmbH & Co. KG
Wim Peeters is electronics engineer with an additional master in IT and over 30 years of experience, including time spent in support, development, consulting, training and database administration. Wim has worked with SQL Server since version 6.5. He has developed in C/C++, Java and C# on Windows and Linux. He writes knowledge base articles to solve IT problems and publishes them on the Lubby Knowledge Platform.