Hi guys, I think I found a gcc bug in gcc-4.1.1-30. I tried to compile root v 5.12.00f http://root.cern.ch/root/Version512.html on a FC6 system, and it failed, complaining that: g++ -O -pipe -Wall -W -Woverloaded-virtual -fPIC -Iinclude -pthread -DUSEPCH -include precompile.h -o proof/src/TProofDraw.o -c proof/src/TProofDraw.cxx include/TProofDraw.h:226: error: parse error in template argument list make: *** [proof/src/TProofDraw.o] Error 1 The critical line being: ~TProofVectorContainer<T>() { delete fVector; } which in and of itself doesn't look too bad. Anyway, I happened to have a system with gcc-4.1.1-31 from rawhide on it, and this works fine. Upgrade my FC6 gcc rpms and all is well. Is there a good reason why this (presumably known) fix cannot be used on FC6? Bill