Eroare de compilare: /tmp/ccIMJDtd.o: In function `Qsort(int, int)': user.cpp:(.text+0x61): undefined reference to `pthread_create' user.cpp:(.text+0xbf): undefined reference to `pthread_create' /usr/lib/gcc/x86_64-linux-gnu/6/32/libstdc++.a(thread.o): In function `std::thread::_M_start_thread(std::unique_ptr<std::thread::_State, std::default_delete<std::thread::_State> >, void (*)())': (.text._ZNSt6thread15_M_start_threadESt10unique_ptrINS_6_StateESt14default_deleteIS1_EEPFvvE+0x24): undefined reference to `pthread_create' /usr/lib/gcc/x86_64-linux-gnu/6/32/libstdc++.a(thread.o): In function `std::thread::_M_start_thread(std::shared_ptr<std::thread::_Impl_base>, void (*)())': (.text._ZNSt6thread15_M_start_threadESt10shared_ptrINS_10_Impl_baseEEPFvvE+0x5d): undefined reference to `pthread_create' collect2: error: ld returned 1 exit status