Simply download, fontconfig-config_2.8.0-3ubuntu9_all.deb. The link will take you to Ubuntu 12.04 fontconfig-config deb package.
After you saved that deb file, extract it to get its contents:
$ dpkg-deb -x fontconfig-config_2.8.0-3ubuntu9_all.deb /tmp/extract/
then replace the content of Debian's /etc/fonts/* with data from /tmp/extract/etc/fonts/*
$ sudo cp -r /tmp/extract/etc/fonts/* /etc/fonts/
Logout and log back in to see the change.
