Hi, I'm trying to use the class implemented by ric in the fit in order to evaluate some systematics and look at the data-MC disagreement. I've out in VubFit.cc fitNtp.cc and fitNtp.hh this line of code: #include "recoilDSys.hh" in order to use the constructors (and the functions) implemented by ric. But I can't compile. The job crashes in that way: g++-2.95 -shared fitNtp.o fitNtpDict.o mesData.o mesDataDict.o recoilAnalysis.o recoilAnalysisDict.o -o ./libFit.so g++-2.95 -g -o VubFit VubFit.o -L/afs/slac.stanford.edu/package/cernroot/30106/lib -lCore -lCint -lHist -lGraf -lGraf3d -lGpad -lTree -lRint -lPostscript -lMatrix -lPhysics -lGui -lm -ldl -lpthread -rdynamic -lMinuit ./libFit.so VubFit.o: In function `recoilDSys::~recoilDSys(void)': /u/ec/asarti/analysis-12a/IslBrecoilUser/recoilDSys.hh:30: undefined reference to `recoilDSys::recoilDSys(char const *, int)' /u/ec/asarti/analysis-12a/IslBrecoilUser/recoilDSys.hh:30: undefined reference to `recoilDSys::recoilDSys(int)' collect2: ld returned 1 exit status gmake: *** [VubFit] Error 1 I've also modified the Makefile in order to be sure that all the libraries are at their place: se http://www.slac.stanford.edu/~asarti/recoil/Makefile Does any one (Urs) has any hint? Thanks to all, Alessio ______________________________________________________ Alessio Sarti Universita' & I.N.F.N. Ferrara tel +39-0532-781928 Ferrara roma +39-06-49914338 SLAC +001-650-926-2972 "Vorrei tanto sapere chi e' che va in giro a costruire quadrati sull'ipotenusa"