Hi, Can someone help me with this error when making my program. make[5]: Entering directory `/home/mahmood/trunk/simulators/CMP.L2Shared.Trace' /usr/bin/g++-4.1 -isystem /opt/boost_1_33_1 -isystem /home/mahmood/simics-3.0.31/src/include -I/home/mahmood/trunk -Ibooksim -Ibooksim/arbiters -Ibooksim/allocators -Ibooksim/routers -Ibooksim/networks -IDRAMSim2 -DTARGET_PLATFORM=v9 -DSELECTED_DEBUG=iface -M -MF wiring.v9_iface_gcc_dep -MM -MT wiring.v9_iface_gcc_o wiring.cpp Putting child 0x016cbf20 (wiring.v9_iface_gcc_dep) PID 31579 on the chain. Live child 0x016cbf20 (wiring.v9_iface_gcc_dep) PID 31579 g++-4.1: error trying to exec 'cc1plus': execvp: No such file or directory More information: mahmood@pc:~$ ls -l /usr/bin/g++* lrwxrwxrwx 1 root root 21 Feb 10 14:56 /usr/bin/g++ -> /etc/alternatives/g++ lrwxrwxrwx 1 root root 52 Feb 11 10:32 /usr/bin/g++-4.1 -> /opt/gcc-4.1.2/host-x86_64-unknown-linux-gnu/gcc/g++ -rwxr-xr-x 1 root root 263328 Apr 16 2012 /usr/bin/g++-4.4 -rwxr-xr-x 1 root root 357312 Apr 16 2012 /usr/bin/g++-4.6 mahmood@pc:~$ /usr/bin/g++-4.1 g++-4.1: no input files mahmood@pc:~$ /usr/bin/g++-4.1 -v Using built-in specs. Target: x86_64-unknown-linux-gnu Configured with: ./configure --prefix=/opt/gcc-4.1.2/installed --disable-multilib Thread model: posix gcc version 4.1.2 Regards, Mahmood