Dear Rene, Fons, Thanks for your help! > it must be INSIDE the class definition Could this crucial piece of information please appear in the user's guide, pg 288? However descriptive you would like to be it would be nice to do it on that page. But for me, this only resulted in a cascade of new errors. I don't know what "tfa4_1e.cxx" does, but it certainly doesn't like me! - John root [3] .L ObjDate.cpp++ Info in <TUnixSystem::ACLiC>: creating shared library /home/jkrane/treemaker/./ObjDate_cpp.dll /home/jkrane/treemaker/./tfa4_1e.o(.text+0x12c):tfa4_1e.cxx: undefined reference to `_G__add_setup_func' /home/jkrane/treemaker/./tfa4_1e.o(.text+0x131):tfa4_1e.cxx: undefined reference to `_G__call_setup_funcs' /home/jkrane/treemaker/./tfa4_1e.o(.text+0x150):tfa4_1e.cxx: undefined reference to `ROOT::TGenericClassInfo::SetNew(void* (*)(void*))' /home/jkrane/treemaker/./tfa4_1e.o(.text+0x164):tfa4_1e.cxx: undefined reference to `ROOT::TGenericClassInfo::SetNewArray(void* (*)(long))' /home/jkrane/treemaker/./tfa4_1e.o(.text+0x178):tfa4_1e.cxx: undefined reference to `ROOT::TGenericClassInfo::SetDelete(void (*)(void*))' /home/jkrane/treemaker/./tfa4_1e.o(.text+0x18c):tfa4_1e.cxx: undefined reference to `ROOT::TGenericClassInfo::SetDeleteArray(void (*)(void*))' /home/jkrane/treemaker/./tfa4_1e.o(.text+0x1a0):tfa4_1e.cxx: undefined reference to `ROOT::TGenericClassInfo::SetDestructor(void (*)(void*))' /home/jkrane/treemaker/./tfa4_1e.o(.text+0x1c3):tfa4_1e.cxx: undefined reference to `ROOT::DefineBehavior(void*, void*)' /home/jkrane/treemaker/./tfa4_1e.o(.text+0x213):tfa4_1e.cxx: undefined reference to `ROOT::TGenericClassInfo::TGenericClassInfo[in-charge](char const*, int, char const*, int, std::type_info const&, ROOT::TInitBehavior const*, void (*)(), TClass* (*)(void const*), int)' /home/jkrane/treemaker/./tfa4_1e.o(.text+0x24d):tfa4_1e.cxx: undefined reference to `ROOT::TGenericClassInfo::SetNew(void* (*)(void*))' /home/jkrane/treemaker/./tfa4_1e.o(.text+0x261):tfa4_1e.cxx: undefined reference to `ROOT::TGenericClassInfo::SetNewArray(void* (*)(long))' /home/jkrane/treemaker/./tfa4_1e.o(.text+0x275):tfa4_1e.cxx: undefined reference to `ROOT::TGenericClassInfo::SetDelete(void (*)(void*))' /home/jkrane/treemaker/./tfa4_1e.o(.text+0x289):tfa4_1e.cxx: undefined reference to `ROOT::TGenericClassInfo::SetDeleteArray(void (*)(void*))' /home/jkrane/treemaker/./tfa4_1e.o(.text+0x29d):tfa4_1e.cxx: undefined reference to `ROOT::TGenericClassInfo::SetDestructor(void (*)(void*))' /home/jkrane/treemaker/./tfa4_1e.o(.text+0x2b9):tfa4_1e.cxx: undefined reference to `ROOT::TGenericClassInfo::SetImplFile(char const*, int)' /home/jkrane/treemaker/./tfa4_1e.o(.text+0x2d7):tfa4_1e.cxx: undefined reference to `ROOT::DefineBehavior(void*, void*)' /home/jkrane/treemaker/./tfa4_1e.o(.text+0x327):tfa4_1e.cxx: undefined reference to `ROOT::TGenericClassInfo::TGenericClassInfo[in-charge](char const*, int, char const*, int, std::type_info const&, ROOT::TInitBehavior const*, void (*)(), TClass* (*)(void const*), int)' /home/jkrane/treemaker/./tfa4_1e.o(.text+0x360):tfa4_1e.cxx: undefined reference to `TObject::TObject[not-in-charge]()'
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