This version of the C++ library comes with gcc-3.2.3, available
(among other places) from ftp.gnu.org.  It is included with MATLAB
in case your distribution doesn't provide it.

If you need the header files to go with it (particularly if you are
building C++ mex files) please visit ftp://ftp.gnu.org/pub/gnu/gcc
and download the 3.2.3 compiler sources.

If you have a newer version of libstdc++ on your system already,
typically in /usr/lib, you may be able to remove or rename this file
and let MATLAB find the one on your own system.  If you have problems
with this approach, however, we recommend using the same compiler
that was used to compile MATLAB, gcc/g++ 3.2.3