Hi These are the installed gcc/g++ on my system $ ls -l /usr/bin/g++* lrwxrwxrwx 1 root root 7 Mar 13 2012 /usr/bin/g++ -> g++-4.6 -rwxr-xr-x 1 root root 94808 Mar 16 2006 /usr/bin/g++-3.4 lrwxrwxrwx 1 root root 52 Feb 6 23:32 /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 The default g++ should point to g++-4.6, however: $ which g++ /usr/local/bin/g++ $ g++ -v Using built-in specs. Target: x86_64-unknown-linux-gnu Configured with: ./configure --disable-multilib Thread model: posix gcc version 4.1.2 How can I change the default g++ to 4.6? Is it safe to create a symbolic link from /usr/local/bin/g++ to /usr/bin/g++ ? Or there may be some libc incompatibilities? Regards, Mahmood