Hi there, i think this is al little offtopic, but as i am in my first steps in Beos programming i think iwill find help here :-) If i do a compile like "g++ pgm1.cpp pgm2.cpp pgm3.cpp" all works well, if i do the same with "gcc pgm1.cpp pgm2.cpp pgm3.cpp" there are many linker errors. The same problem occurs when i try to use jam, only for expierience. My jam-file then looks like this "Main kap6 : kap6.cpp Student_info.cpp grade.cpp median.cpp ; " and behaves same like gcc. What is the difference between gcc and g++ and how can i tell jam which of them to use? Would be happy for help Andre