# ls /usr/bin/x86* -l
lrwxrwxrwx 1 root root 7 Jun 3 01:27 /usr/bin/x86_64 -> setarch
lrwxrwxrwx 1 root root 7 Jun 3 01:27 /usr/bin/x86_64-linux-gnu-cpp -> cpp-4.7
lrwxrwxrwx 1 root root 7 Jan 30 13:55 /usr/bin/x86_64-linux-gnu-cpp-4.4 -> cpp-4.4
lrwxrwxrwx 1 root root 7 Apr 13 06:08 /usr/bin/x86_64-linux-gnu-cpp-4.6 -> cpp-4.6
lrwxrwxrwx 1 root root 7 Jun 3 01:27 /usr/bin/x86_64-linux-gnu-cpp-4.7 -> cpp-4.7
lrwxrwxrwx 1 root root 7 Apr 22 02:44 /usr/bin/x86_64-linux-gnu-g++ -> g++-4.7
lrwxrwxrwx 1 root root 7 Apr 15 07:12 /usr/bin/x86_64-linux-gnu-g++-4.7 -> g++-4.7
lrwxrwxrwx 1 root root 7 Apr 22 02:44 /usr/bin/x86_64-linux-gnu-gcc -> gcc-4.7
lrwxrwxrwx 1 root root 7 Jan 30 13:57 /usr/bin/x86_64-linux-gnu-gcc-4.4 -> gcc-4.4
lrwxrwxrwx 1 root root 7 Apr 13 06:10 /usr/bin/x86_64-linux-gnu-gcc-4.6 -> gcc-4.6
lrwxrwxrwx 1 root root 7 Jun 3 01:27 /usr/bin/x86_64-linux-gnu-gcc-4.7 -> gcc-4.7
Não há diferença que pareça; tente alterar o link e veja se funciona.