Thanks Nat, it was just fixed by changing the compiler as you suggest, our computer administrator used FC8 and that also worked,  
best
Preben

On 18/11/2010, at 15.51, Nathaniel Echols wrote:

On Thu, Nov 18, 2010 at 1:17 AM, J. Preben Morth <[email protected]> wrote:
I am trying to install phenix on a red hat enterprise 5.5 distribution,
but get this following error, when trying to run phenix
> ImportError: /usr/lib64/libstdc++.so.6: version `GLIBCXX_3.4.9' not found
I do have libstdc++-4.1.2-48.el5 missing excatly the "GLIBCXX 3.4.9' but have ...3.4.8

Which installer did you use?  We build multiple versions for 64-bit Linux because of possible binary incompatibilities; usually the one built on FC3 is the most portable.

-Nat
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J. Preben Morth, Ph.D
Group Leader
Membrane Transport Group
Nordic EMBL Partnership
Centre for Molecular Medicine Norway (NCMM)
University of Oslo
P.O.Box 1137 Blindern
0318 Oslo, Norway

Tel: +47 2284 0794