Okay, I've done some more testing and I have got it to work on Debain and my Coldfusion MX7.02 server :-)
compat-libstdc++-7.3-2.96.118.i386.rpm is all extra that is needed.
To install this library on Debian: download the rpm, convert it to a debian package and install.
Use alien to convert the package.
Install alien: apt-get install alien
Download the compat-libstdc++-7.3-2.96.118.i386.rpm file: wget ftp://ftp.uni-bayreuth.de/pub/linux/...6.118.i386.rpm
convert the .rpm: alien compat-libstdc++-7.3-2.96.118.i386.rpm
install the .deb file: dpkg -i compat-libstdc++_7.3-3.96_i386.deb
With a bit of luck (it does work on my VMware system) you are now able to register C++ CFX tags with Coldfusion MX7