Hi Phillippe, I just deleted all off cygwin and root and mysql and started fresh late this morning. I have reinstalled cygwin, root, and mysql and rebuilt root. I have started root and tried to build the following class: // A rudimentary class class Rude { int i,j; public: void dont_want(int ii){ i=0; } void dont_need(int jj){ j=jj; } }; It produces what looks like the same output. I copy the brand new dump below. It shows undefined references to the same system-type commands. root [0] .L Rude.cpp++ Info in <TUnixSystem::ACLiC>: creating shared library /home/jkrane/treemaker/./Rude_cpp.dll /home/jkrane/treemaker/./td30_6.o(.text+0x60):td30_6.cxx: undefined reference to `_G__add_setup_func' /home/jkrane/treemaker/./td30_6.o(.text+0x65):td30_6.cxx: undefined reference to `_G__call_setup_funcs' /home/jkrane/treemaker/./td30_6.o(.text+0xbf):td30_6.cxx: undefined reference to `ROOT::TGenericClassInfo::SetNew(void* (*)(void*))' /home/jkrane/treemaker/./td30_6.o(.text+0xd3):td30_6.cxx: undefined reference to `ROOT::TGenericClassInfo::SetNewArray(void* (*)(long))' ...etc... collect2: ld returned 1 exit status Error in <ACLiC>: Compilation failed! root [1] .q - John
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