Hi Marc, <div>2008/1/14, Marc Chamberland <<a href="mailto:mchamber@connect.carleton.ca">mchamber@connect.carleton.ca</a>>:<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> Hi Gate Users! I'm trying to install Gate v3.1.2 on a Linux system. Gate compiles fine, but the make command fails when it comes to linking. Here's the message I get: Using granular libraries ... Linking Gate ... ./tmp/Linux-g++/Gate/libGate.so: undefined reference to `TTree::SetEntryList(TEntryList*, char const*)' ./tmp/Linux-g++/Gate/libGate.so: undefined reference to `TTree::CopyAddresses(TTree*, bool)' ./tmp/Linux-g++/Gate/libGate.so: undefined reference to `TTree::ResetBranchAddress(TBranch*)' ./tmp/Linux-g++/Gate/libGate.so: undefined reference to `TTree::GetEntryList()' collect2: ld returned 1 exit status make: *** [bin/Linux-g++/Gate] Error 1 On this system, Root 5.14.00g is installed (as the requirements state). Now, I know next to nothing about this, but I'm under the impression libGate.so is looking for the functions SetEntryList, etc., in the TTree class of Root. However, when I look at TTree.h, I see that these functions are not defined anywhere. BUT! I see from the Root website that those functions are defined in TTree.h of the latest Root release but not in TTree.h of version 5.14.</blockquote><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Does this mean that  I should be using a newer version than Root 5.14?</blockquote><div> Not at all, 5.14 works well with gate3.1.2 version. When you get "Undefined reference" error messages while linking, that means that the definition is present in the header file but not in the corresponding library. I think your problem here is just related to your environment (assuming ROOT is well installed). Have you fixed the ROOTSYS environment variable before launching make, have you source the env_gate.sh/csh file before launching make, have you added the ROOT libraries path to your LD_LIBRARY_PATH ??? </div> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Anyone else encountered this problem? I'd appreciate any help you can provide me in resolving this problem. Thank you in advance! ~Marc _______________________________________________ Gate-users mailing list <a href="mailto:Gate-users@lists.healthgrid.org">Gate-users@lists.healthgrid.org</a> <a href="http://lists.healthgrid.org/mailman/listinfo/gate-users"> http://lists.healthgrid.org/mailman/listinfo/gate-users</a> </blockquote></div> Good luck ! Simon