Input_Output_Manager.o: In function `_ZN20Input_Output_ManagerC2ERSt14basic_ifstreamIcSt11char_traitsIcEEPKc': Input_Output_Manager.cpp:(.text+0x2f): undefined reference to `_ZNSt9basic_iosIcSt11char_traitsIcEE4initEPSt15basic_streambufIcS1_E' Input_Output_Manager.cpp:(.text+0x4a): undefined reference to `_ZNSt13basic_filebufIcSt11char_traitsIcEEC1Ev' ・ ・ ・ Input_Output_Manager.o:(.gnu.linkonce.r._ZTI20Input_Output_Manager+0x0): undefin ed reference to `_ZTVN10__cxxabiv120__si_class_type_infoE' Input_Output_Manager.o:(.gnu.linkonce.r._ZTI20Input_Output_Manager+0x8): undefin ed reference to `_ZTISt14basic_ofstreamIcSt11char_traitsIcEE' collect2: ld returned 1 exit status make: *** [../apriori] Error 1
