Your issue is exactly why the official wheezy-backports repository exists. http://www.backports.org You could request a backport of 2.4.9 on their mailing list: https://lists.debian.org/debian-backports/
Though I or yourself would be much faster in creating the packages.
Edit: I would backport it against the version of libav in wheezy-backports, though. Plus the build-dependencies are hefty, so it's a big download if you have a slow Net connection.
Are you going to be developing against this library, or just have a program that requires it?
Edit: Opencv 2.4.9 needs this line added to the first section in the debian/control file
- Code: Select all
X-Python-Version: 2.7
This tells it to only try to create and install python2.7 versions, apparently python2.6 in Wheezy is too old. That is another reason the upstream version probably would not work even with a newer libc6, because of the python differences.