DRAMSIM2 on gem5

[NedasadatTaheri]

Hi
I tried to use DRAMSIM2 on gem5 but when I tried to compile I got following errors
"
/bin/ld: build/dramsim2/libdramsim2.a(MultiChannelMemorySystem.os): in function DRAMSim::MultiChannelMemorySystem::printStats(bool)': MultiChannelMemorySystem.cpp:(.text+0x2556): undefined reference to SHOW_SIM_OUTPUT'
/bin/ld: MultiChannelMemorySystem.cpp:(.text+0x25da): undefined reference to SHOW_SIM_OUTPUT' /bin/ld: build/dramsim2/libdramsim2.a(MemorySystem.os): in function DRAMSim::MemorySystem::MemorySystem(unsigned int, unsigned int, DRAMSim::CSVWriter&, std::ostream&)':
MemorySystem.cpp:(.text+0x16c): undefined reference to SHOW_SIM_OUTPUT' /bin/ld: build/dramsim2/libdramsim2.a(Rank.os): in function DRAMSim::Rank::receiveFromBus(DRAMSim::BusPacket*)':
Rank.cpp:(.text+0x431): undefined reference to SHOW_SIM_OUTPUT' /bin/ld: build/dramsim2/libdramsim2.a(Rank.os): in function DRAMSim::Rank::update()':
Rank.cpp:(.text+0x1c85): undefined reference to SHOW_SIM_OUTPUT' /bin/ld: build/dramsim2/libdramsim2.a(Rank.os):Rank.cpp:(.text+0x1cdb): more undefined references to SHOW_SIM_OUTPUT' follow
collect2: error: ld returned 1 exit status
scons: *** [build/ARM/gem5.opt] Error 1
scons: building terminated because of errors.
"
Would you please help me with that?
Thanks
Neda