Rene, I did (I think!) as you suggested. Do I need a special LinkDef to link on a global? (Is there a list of pragma's somewhere?) When I put the real declaration (ie no extern qualifier) A* gAptr; in to A.h I got mulitiple definitions on linking. When I put the extern statement in A.h, nothing changed. That is the code as attached? Thanks very much, Chris PS: Root 3/04_02 although I've had the same problem on a 3/05 as well. Running Linux 2.4.18-27.7.xsmp #1 SMP -- ******************************** Chris Jillings Kellogg Radiation Laboratory California Institute of Technology jillings@caltech.edu http://www.krl.caltech.edu/~jillings ********************************
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